diff --git a/Kernel/src/renderive/real_time_data/History_Real_Time_Data.hpp b/Kernel/src/renderive/real_time_data/History_Real_Time_Data.hpp
index fbe0e71..f1fe96a 100644
--- a/Kernel/src/renderive/real_time_data/History_Real_Time_Data.hpp
+++ b/Kernel/src/renderive/real_time_data/History_Real_Time_Data.hpp
@@ -3,6 +3,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <iterator>
+#include <limits>
 #include <memory_resource>
 #include <mutex>
 #include <utility>
@@ -26,7 +27,9 @@ public:
     History_Real_Time_Data(const History_Real_Time_Data&) = delete;
     History_Real_Time_Data& operator=(const History_Real_Time_Data&) = delete;
     void update(Value value);
+    void update(Value value, std::size_t retain_latest_count);
     void clear();
+    std::size_t retain_latest(std::size_t count);
     Container snapshot() const;
     std::size_t size() const;
     std::uint64_t revision() const;
diff --git a/Kernel/src/renderive/real_time_data/History_Real_Time_Data.inl b/Kernel/src/renderive/real_time_data/History_Real_Time_Data.inl
index fdcbcc7..972521b 100644
--- a/Kernel/src/renderive/real_time_data/History_Real_Time_Data.inl
+++ b/Kernel/src/renderive/real_time_data/History_Real_Time_Data.inl
@@ -39,6 +39,10 @@ void History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::reserve_upd
 }
 template <class Value_Type, class Container, Mutex_Type Mutex, class Observer>
 void History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::update(Value value) {
+    update(std::move(value), std::numeric_limits<std::size_t>::max());
+}
+template <class Value_Type, class Container, Mutex_Type Mutex, class Observer>
+void History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::update(Value value, std::size_t retain_latest_count) {
     std::lock_guard mutation_lock(mutation_mutex_);
     Real_Time_Data_Observation observation;
     {
@@ -47,6 +51,12 @@ void History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::update(Valu
         values_.push_back(std::move(value));
         const std::uint64_t update_time_ns = observer_.now_ns();
         update_times_[update_times_size_++] = update_time_ns;
+        if(values_.size() > retain_latest_count) {
+            const std::size_t discarded = values_.size() - retain_latest_count;
+            values_.erase(values_.begin(), std::next(values_.begin(), static_cast<std::ptrdiff_t>(discarded)));
+            std::move(update_times_ + discarded, update_times_ + update_times_size_, update_times_);
+            update_times_size_ -= discarded;
+        }
         ++revision_;
         ++total_update_count_;
         last_update_time_ns_ = update_time_ns;
@@ -69,6 +79,25 @@ void History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::clear() {
     observer_.observe(observation);
 }
 template <class Value_Type, class Container, Mutex_Type Mutex, class Observer>
+std::size_t History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::retain_latest(std::size_t count) {
+    std::lock_guard mutation_lock(mutation_mutex_);
+    Real_Time_Data_Observation observation;
+    std::size_t discarded{};
+    {
+        std::lock_guard<Mutex> lock(mutex_);
+        if(values_.size() <= count)
+            return 0;
+        discarded = values_.size() - count;
+        values_.erase(values_.begin(), std::next(values_.begin(), static_cast<std::ptrdiff_t>(discarded)));
+        std::move(update_times_ + discarded, update_times_ + update_times_size_, update_times_);
+        update_times_size_ -= discarded;
+        ++revision_;
+        observation = {Real_Time_Data_Observation_Event::discarded, {this, Real_Time_Data_Retention::history, revision_, last_update_time_ns_, total_update_count_, values_.size()}};
+    }
+    observer_.observe(observation);
+    return discarded;
+}
+template <class Value_Type, class Container, Mutex_Type Mutex, class Observer>
 auto History_Real_Time_Data<Value_Type, Container, Mutex, Observer>::snapshot() const -> Container {
     std::lock_guard<Mutex> lock(mutex_);
     return values_;
diff --git a/Kernel/tests/renderive/real_time_data/Real_Time_Data_Test.cpp b/Kernel/tests/renderive/real_time_data/Real_Time_Data_Test.cpp
index 18041a1..f6364f3 100644
--- a/Kernel/tests/renderive/real_time_data/Real_Time_Data_Test.cpp
+++ b/Kernel/tests/renderive/real_time_data/Real_Time_Data_Test.cpp
@@ -45,6 +45,18 @@ TEST(history_real_time_data_test, retains_all_values_until_explicit_discard) {
     EXPECT_EQ(data.discard_before_time_ns(15), 2);
     EXPECT_EQ(data.snapshot(), (std::vector<int>{3}));
 }
+TEST(history_real_time_data_test, retains_latest_requested_value_count) {
+    History_Real_Time_Data<int> data;
+    data.update(1);
+    data.update(2, 2);
+    data.update(3, 2);
+    EXPECT_EQ(data.snapshot(), (std::vector<int>{2, 3}));
+    EXPECT_EQ(data.revision(), 3);
+    EXPECT_EQ(data.retain_latest(2), 0);
+    data.update(4);
+    EXPECT_EQ(data.retain_latest(2), 1);
+    EXPECT_EQ(data.snapshot(), (std::vector<int>{3, 4}));
+}
 TEST(real_time_data_attachment_test, binds_updates_to_renderable_frame_strategy) {
     Scene2D_Context<> scene;
     auto latest = std::make_shared<Real_Time_Data_Test_Latest>();
diff --git a/render_2D/plottable/Afterglow.cpp b/render_2D/plottable/Afterglow.cpp
index 9304398..de34771 100644
--- a/render_2D/plottable/Afterglow.cpp
+++ b/render_2D/plottable/Afterglow.cpp
@@ -1,49 +1,44 @@
 #include "Afterglow.h"
 #include "Heatmap_Utils.h"
+#include "Plottable_Real_Time_Data.h"
 #include "../render/Blend2D_Cache.h"
 #include <algorithm>
 #include <deque>
 namespace renderive {
 namespace detail {
 namespace {
-struct Afterglow_Runtime_Base {};
-struct Afterglow_Runtime {
-    std::deque<std::vector<double>> history;
-};
-using Afterglow_Runtime_State = Double_State_Strategy<Afterglow_Runtime_Base, Afterglow_Runtime>;
+using Afterglow_History = Plottable_History_Real_Time_Data<std::vector<double>, std::deque<std::vector<double>>>;
 }
 struct Afterglow_Control::Impl {
-    Impl(std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Axis> power) : frequency_axis(std::move(frequency)), power_axis(std::move(power)) {}
+    Impl(Afterglow_Control& owner, std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Axis> power)
+        : frequency_axis(std::move(frequency)), power_axis(std::move(power)), history(observe_real_time_data(owner)) {}
     std::shared_ptr<Frequency_Axis> frequency_axis;
     std::shared_ptr<Axis> power_axis;
-    Afterglow_Runtime_State runtime;
+    Afterglow_History history;
 };
 Afterglow_Control::Afterglow_Control(Plot_Core& plot, const Afterglow_Properties& properties, std::shared_ptr<Frequency_Axis> frequency_axis, std::shared_ptr<Axis> power_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(frequency_axis), std::move(power_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(frequency_axis), std::move(power_axis))) {}
 Afterglow_Control::~Afterglow_Control() = default;
 std::size_t Afterglow_Control::history_count() const {
-    return impl_->runtime.read([](const Afterglow_Runtime& runtime) { return runtime.history.size(); });
+    return impl_->history.size();
 }
 std::size_t Afterglow_Control::latest_spectrum_point_count() const {
-    return impl_->runtime.read([](const Afterglow_Runtime& runtime) { return runtime.history.empty() ? 0 : runtime.history.back().size(); });
+    const auto history = impl_->history.snapshot();
+    return history.empty() ? 0 : history.back().size();
 }
 std::size_t Afterglow_Control::rendered_cell_count() const {
     const auto state = properties();
-    const auto runtime = impl_->runtime.read([](const Afterglow_Runtime& value) { return value; });
-    if(runtime.history.empty())
+    const auto history = impl_->history.snapshot();
+    if(history.empty())
         return 0;
-    const int width = std::min(state.frequency_point_size.get(), static_cast<int>(runtime.history.back().size()));
+    const int width = std::min(state.frequency_point_size.get(), static_cast<int>(history.back().size()));
     const int height = state.power_point_size.get() > 0 ? state.power_point_size.get() : std::max(1, static_cast<int>(impl_->power_axis->pixel_length()));
     return width > 0 && height > 0 ? static_cast<std::size_t>(width) * static_cast<std::size_t>(height) : 0;
 }
 void Afterglow_Control::append_spectrum(std::span<const double> values) {
     if(get<&Afterglow_Properties::frequency_point_size>() <= 0)
         set<&Afterglow_Properties::frequency_point_size>(static_cast<int>(values.size()));
-    impl_->runtime.update([values](Afterglow_Runtime& runtime) {
-        runtime.history.emplace_back(values.begin(), values.end());
-        while(runtime.history.size() > 64)
-            runtime.history.pop_front();
-    });
+    impl_->history.update({values.begin(), values.end()}, 64);
     changed();
 }
 void Afterglow_Control::append_spectrum(std::pmr::vector<double>&& values) {
@@ -51,21 +46,20 @@ void Afterglow_Control::append_spectrum(std::pmr::vector<double>&& values) {
 }
 void Afterglow_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
 }
 void Afterglow_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
-    if(runtime.history.empty())
+    const auto history = impl_->history.snapshot();
+    if(history.empty())
         return;
-    const int width = std::min(state.frequency_point_size.get(), static_cast<int>(runtime.history.back().size()));
+    const int width = std::min(state.frequency_point_size.get(), static_cast<int>(history.back().size()));
     const int height = state.power_point_size.get() > 0 ? state.power_point_size.get() : std::max(1, static_cast<int>(impl_->power_axis->pixel_length()));
     if(width <= 0 || height <= 0)
         return;
     std::vector<double> intensity(static_cast<std::size_t>(width) * height);
     double weight = 1.0;
     const double decay = 1.0 - state.attenuation_rate.get();
-    for(auto iterator = runtime.history.rbegin(); iterator != runtime.history.rend(); ++iterator) {
+    for(auto iterator = history.rbegin(); iterator != history.rend(); ++iterator) {
         const int count = std::min(width, static_cast<int>(iterator->size()));
         for(int x = 0; x < count; ++x) {
             const double normalized = normalized_value((*iterator)[static_cast<std::size_t>(x)], state.power_range);
diff --git a/render_2D/plottable/Constellation_Diagram.cpp b/render_2D/plottable/Constellation_Diagram.cpp
index 0e05a01..91071aa 100644
--- a/render_2D/plottable/Constellation_Diagram.cpp
+++ b/render_2D/plottable/Constellation_Diagram.cpp
@@ -1,4 +1,5 @@
 #include "Constellation_Diagram.h"
+#include "Plottable_Real_Time_Data.h"
 #include "../render/Blend2D_Cache.h"
 #include <algorithm>
 #include <chrono>
@@ -12,34 +13,29 @@ struct Timed_Point {
     PointF point;
     std::chrono::steady_clock::time_point time;
 };
-struct Constellation_Runtime_Base {};
-struct Constellation_Runtime {
-    std::deque<Timed_Point> points;
-};
-using Constellation_Runtime_State = Double_State_Strategy<Constellation_Runtime_Base, Constellation_Runtime>;
+using Constellation_History = Plottable_History_Real_Time_Data<Timed_Point, std::deque<Timed_Point>>;
 }
 struct Constellation_Diagram_Control::Impl {
-    Impl(std::shared_ptr<Axis> i, std::shared_ptr<Axis> q) : i_axis(std::move(i)), q_axis(std::move(q)) {}
+    Impl(Constellation_Diagram_Control& owner, std::shared_ptr<Axis> i, std::shared_ptr<Axis> q)
+        : i_axis(std::move(i)), q_axis(std::move(q)), points(observe_real_time_data(owner)) {}
     std::shared_ptr<Axis> i_axis;
     std::shared_ptr<Axis> q_axis;
-    Constellation_Runtime_State runtime;
+    Constellation_History points;
 };
 Constellation_Diagram_Control::Constellation_Diagram_Control(Plot_Core& plot, const Constellation_Diagram_Properties& properties, std::shared_ptr<Axis> i_axis, std::shared_ptr<Axis> q_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(i_axis), std::move(q_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(i_axis), std::move(q_axis))) {}
 Constellation_Diagram_Control::~Constellation_Diagram_Control() = default;
 void Constellation_Diagram_Control::append_point(PointF point) {
     const auto now = std::chrono::steady_clock::now();
     const int lifetime = get<&Constellation_Diagram_Properties::point_lifetime_ms>();
-    impl_->runtime.update([point, now, lifetime](Constellation_Runtime& runtime) {
-        runtime.points.push_back({point, now});
-        const auto cutoff = now - std::chrono::milliseconds(lifetime);
-        while(!runtime.points.empty() && runtime.points.front().time < cutoff)
-            runtime.points.pop_front();
-    });
+    const auto cutoff = now - std::chrono::milliseconds(lifetime);
+    const auto cutoff_ns = std::chrono::duration_cast<std::chrono::nanoseconds>(cutoff.time_since_epoch()).count();
+    impl_->points.update({point, now});
+    impl_->points.discard_before_time_ns(static_cast<std::uint64_t>(cutoff_ns));
     changed();
 }
 std::size_t Constellation_Diagram_Control::point_count() const {
-    return impl_->runtime.read([](const Constellation_Runtime& runtime) { return runtime.points.size(); });
+    return impl_->points.size();
 }
 void Constellation_Diagram_Control::fit_square_to_axes() {
     const auto state = properties();
@@ -49,11 +45,10 @@ void Constellation_Diagram_Control::fit_square_to_axes() {
 }
 void Constellation_Diagram_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
 }
 void Constellation_Diagram_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
+    const auto points = impl_->points.snapshot();
     const Axis_Transform x = impl_->i_axis->transform();
     const Axis_Transform y = impl_->q_axis->transform();
     const int count = static_cast<int>(state.type);
@@ -64,7 +59,7 @@ void Constellation_Diagram_Control::paint(Painter& painter) {
         painter.circle({x.coord_to_pixel(point.x), y.coord_to_pixel(point.y)}, 3.0, Pen{state.anchor_color}, Brush{state.anchor_color, Brush_Style::Solid});
     }
     const auto cutoff = std::chrono::steady_clock::now() - std::chrono::milliseconds(state.point_lifetime_ms.get());
-    for(const auto& value : runtime.points) {
+    for(const auto& value : points) {
         if(value.time < cutoff)
             continue;
         painter.circle({x.coord_to_pixel(value.point.x), y.coord_to_pixel(value.point.y)}, 2.0, Pen{state.point_color}, Brush{state.point_color, Brush_Style::Solid});
diff --git a/render_2D/plottable/Frequency_Trace.cpp b/render_2D/plottable/Frequency_Trace.cpp
index f32f986..0d4151c 100644
--- a/render_2D/plottable/Frequency_Trace.cpp
+++ b/render_2D/plottable/Frequency_Trace.cpp
@@ -1,4 +1,5 @@
 #include "Frequency_Trace.h"
+#include "Plottable_Real_Time_Data.h"
 #include "../render/Blend2D_Cache.h"
 #include <algorithm>
 #include <deque>
@@ -6,53 +7,46 @@
 namespace renderive {
 namespace detail {
 namespace {
-struct Frequency_Trace_Runtime_Base {};
-struct Frequency_Trace_Runtime {
-    std::deque<std::pair<int, double>> samples;
-};
-using Frequency_Trace_Runtime_State = Double_State_Strategy<Frequency_Trace_Runtime_Base, Frequency_Trace_Runtime>;
+using Frequency_Trace_History = Plottable_History_Real_Time_Data<std::pair<int, double>, std::deque<std::pair<int, double>>>;
 }
 struct Frequency_Trace_Control::Impl {
-    Impl(std::shared_ptr<Time_Axis> time, std::shared_ptr<Axis> value) : time_axis(std::move(time)), value_axis(std::move(value)) {}
+    Impl(Frequency_Trace_Control& owner, std::shared_ptr<Time_Axis> time, std::shared_ptr<Axis> value)
+        : time_axis(std::move(time)), value_axis(std::move(value)), samples(observe_real_time_data(owner)) {}
     std::shared_ptr<Time_Axis> time_axis;
     std::shared_ptr<Axis> value_axis;
-    Frequency_Trace_Runtime_State runtime;
+    Frequency_Trace_History samples;
 };
 Frequency_Trace_Control::Frequency_Trace_Control(Plot_Core& plot, const Frequency_Trace_Properties& properties, std::shared_ptr<Time_Axis> time_axis, std::shared_ptr<Axis> value_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(time_axis), std::move(value_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(time_axis), std::move(value_axis))) {}
 Frequency_Trace_Control::~Frequency_Trace_Control() = default;
 void Frequency_Trace_Control::append_sample(int tick, double value) {
     const int limit = std::max(2, impl_->time_axis->visible_time_point_count());
-    impl_->runtime.update([tick, value, limit](Frequency_Trace_Runtime& runtime) {
-        runtime.samples.emplace_back(tick, value);
-        while(runtime.samples.size() > static_cast<std::size_t>(limit))
-            runtime.samples.pop_front();
-    });
+    impl_->samples.update({tick, value}, static_cast<std::size_t>(limit));
     changed();
 }
 void Frequency_Trace_Control::append_sample(Time_Of_Day time, double value) {
     append_sample(impl_->time_axis->append_time(time), value);
 }
 std::size_t Frequency_Trace_Control::sample_count() const {
-    return impl_->runtime.read([](const Frequency_Trace_Runtime& runtime) { return runtime.samples.size(); });
+    return impl_->samples.size();
 }
 std::size_t Frequency_Trace_Control::rendered_point_count() const {
-    return sample_count() >= 2 ? sample_count() : 0;
+    const std::size_t count = sample_count();
+    return count >= 2 ? count : 0;
 }
 void Frequency_Trace_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
 }
 void Frequency_Trace_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
-    if(runtime.samples.size() < 2)
+    const auto samples = impl_->samples.snapshot();
+    if(samples.size() < 2)
         return;
     const Axis_Transform x = impl_->time_axis->transform();
     const Axis_Transform y = impl_->value_axis->transform();
     std::vector<PointF> points;
-    points.reserve(runtime.samples.size());
-    for(const auto& [tick, value] : runtime.samples)
+    points.reserve(samples.size());
+    for(const auto& [tick, value] : samples)
         points.push_back({x.coord_to_pixel(tick), y.coord_to_pixel(value)});
     painter.polyline(points, state.pen);
 }
diff --git a/render_2D/plottable/Plottable_Real_Time_Data.h b/render_2D/plottable/Plottable_Real_Time_Data.h
new file mode 100644
index 0000000..d015001
--- /dev/null
+++ b/render_2D/plottable/Plottable_Real_Time_Data.h
@@ -0,0 +1,17 @@
+#pragma once
+#include "../renderable/Renderable.h"
+#include <renderive/base/observer/Observer.hpp>
+#include <renderive/real_time_data/Frame_Strategy_Observer.hpp>
+#include <renderive/real_time_data/History_Real_Time_Data.hpp>
+#include <renderive/real_time_data/Latest_Real_Time_Data.hpp>
+#include <mutex>
+namespace renderive::detail {
+using Plottable_Real_Time_Data_Observer = Observer_State<Frame_Strategy_Real_Time_Data_Observer>;
+inline Plottable_Real_Time_Data_Observer observe_real_time_data(Renderable& renderable) {
+    return Plottable_Real_Time_Data_Observer(Frame_Strategy_Real_Time_Data_Observer(renderable));
+}
+template <class Value>
+using Plottable_Latest_Real_Time_Data = Latest_Real_Time_Data<Value, std::mutex, Plottable_Real_Time_Data_Observer>;
+template <class Value, class Container>
+using Plottable_History_Real_Time_Data = History_Real_Time_Data<Value, Container, std::mutex, Plottable_Real_Time_Data_Observer>;
+}
diff --git a/render_2D/plottable/Selection_Rectangle_Overlay.cpp b/render_2D/plottable/Selection_Rectangle_Overlay.cpp
index fff33b7..158ab74 100644
--- a/render_2D/plottable/Selection_Rectangle_Overlay.cpp
+++ b/render_2D/plottable/Selection_Rectangle_Overlay.cpp
@@ -1,4 +1,5 @@
 #include "Selection_Rectangle_Overlay.h"
+#include "Plottable_Real_Time_Data.h"
 #include "../render/Blend2D_Cache.h"
 #include <algorithm>
 #include <cmath>
@@ -6,14 +7,13 @@
 namespace renderive {
 namespace detail {
 namespace {
-struct Selection_Runtime_Base {};
-struct Selection_Runtime {
-    std::vector<RectF> regions;
+struct Selection_Interaction_Base {};
+struct Selection_Interaction {
     bool selecting{};
     PointF selection_start{};
     PointF selection_current{};
 };
-using Selection_Runtime_State = Double_State_Strategy<Selection_Runtime_Base, Selection_Runtime>;
+using Selection_Interaction_State = Double_State_Strategy<Selection_Interaction_Base, Selection_Interaction>;
 RectF axis_content_rect(const Axis_Transform& horizontal, const Axis_Transform& vertical) {
     const double x1 = horizontal.coord_to_pixel(horizontal.coordinate_range.origin);
     const double x2 = horizontal.coord_to_pixel(horizontal.coordinate_range.target);
@@ -23,21 +23,23 @@ RectF axis_content_rect(const Axis_Transform& horizontal, const Axis_Transform&
 }
 }
 struct Selection_Rectangle_Overlay_Control::Impl {
-    Impl(std::shared_ptr<Abs_Axis> horizontal, std::shared_ptr<Abs_Axis> vertical) : horizontal_axis(std::move(horizontal)), vertical_axis(std::move(vertical)) {}
+    Impl(Selection_Rectangle_Overlay_Control& owner, std::shared_ptr<Abs_Axis> horizontal, std::shared_ptr<Abs_Axis> vertical)
+        : horizontal_axis(std::move(horizontal)), vertical_axis(std::move(vertical)), regions(observe_real_time_data(owner)) {}
     std::shared_ptr<Abs_Axis> horizontal_axis;
     std::shared_ptr<Abs_Axis> vertical_axis;
-    Selection_Runtime_State runtime;
+    Plottable_History_Real_Time_Data<RectF, std::vector<RectF>> regions;
+    Selection_Interaction_State interaction;
 };
 Selection_Rectangle_Overlay_Control::Selection_Rectangle_Overlay_Control(Plot_Core& plot, const Selection_Rectangle_Overlay_Properties& properties, std::shared_ptr<Abs_Axis> horizontal_axis, std::shared_ptr<Abs_Axis> vertical_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(horizontal_axis), std::move(vertical_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(horizontal_axis), std::move(vertical_axis))) {}
 Selection_Rectangle_Overlay_Control::~Selection_Rectangle_Overlay_Control() = default;
 std::vector<RectF> Selection_Rectangle_Overlay_Control::selected_regions() const {
-    return impl_->runtime.get<&Selection_Runtime::regions>();
+    return impl_->regions.snapshot();
 }
 void Selection_Rectangle_Overlay_Control::clear_selected_regions() {
-    impl_->runtime.update([](Selection_Runtime& runtime) {
-        runtime.regions.clear();
-        runtime.selecting = false;
+    impl_->regions.clear();
+    impl_->interaction.update([](Selection_Interaction& interaction) {
+        interaction.selecting = false;
     });
     changed();
 }
@@ -47,9 +49,9 @@ void Selection_Rectangle_Overlay_Control::handle_event(const Event& event) {
         const auto& pointer = static_cast<const Pointer_Event&>(event);
         if(pointer.button != Mouse_Button::Left || !content.contains(pointer.position))
             return;
-        impl_->runtime.update([&](Selection_Runtime& runtime) {
-            runtime.selecting = true;
-            runtime.selection_start = runtime.selection_current = pointer.position;
+        impl_->interaction.update([&](Selection_Interaction& interaction) {
+            interaction.selecting = true;
+            interaction.selection_start = interaction.selection_current = pointer.position;
         });
         event.accept();
         changed();
@@ -58,10 +60,10 @@ void Selection_Rectangle_Overlay_Control::handle_event(const Event& event) {
     if(event.type == Event_Type::Pointer_Move) {
         const auto& pointer = static_cast<const Pointer_Event&>(event);
         bool selecting{};
-        impl_->runtime.update([&](Selection_Runtime& runtime) {
-            selecting = runtime.selecting;
+        impl_->interaction.update([&](Selection_Interaction& interaction) {
+            selecting = interaction.selecting;
             if(selecting)
-                runtime.selection_current = pointer.position;
+                interaction.selection_current = pointer.position;
         });
         if(!selecting)
             return;
@@ -74,30 +76,30 @@ void Selection_Rectangle_Overlay_Control::handle_event(const Event& event) {
     const auto& pointer = static_cast<const Pointer_Event&>(event);
     PointF start;
     bool selecting{};
-    impl_->runtime.update([&](Selection_Runtime& runtime) {
-        selecting = runtime.selecting;
+    impl_->interaction.update([&](Selection_Interaction& interaction) {
+        selecting = interaction.selecting;
         if(!selecting)
             return;
-        runtime.selecting = false;
-        start = runtime.selection_start;
-        runtime.selection_current = pointer.position;
+        interaction.selecting = false;
+        start = interaction.selection_start;
+        interaction.selection_current = pointer.position;
     });
     if(!selecting)
         return;
     const RectF region{impl_->horizontal_axis->pixel_to_coord(start.x), impl_->vertical_axis->pixel_to_coord(start.y), impl_->horizontal_axis->pixel_to_coord(pointer.position.x) - impl_->horizontal_axis->pixel_to_coord(start.x), impl_->vertical_axis->pixel_to_coord(pointer.position.y) - impl_->vertical_axis->pixel_to_coord(start.y)};
     if(std::abs(region.width) > 1e-9 && std::abs(region.height) > 1e-9)
-        impl_->runtime.update([region](Selection_Runtime& runtime) { runtime.regions.push_back(region.normalized()); });
+        impl_->regions.update(region.normalized());
     event.accept();
     changed();
 }
 void Selection_Rectangle_Overlay_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
+    impl_->interaction.publish();
 }
 void Selection_Rectangle_Overlay_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
-    for(const RectF& region : runtime.regions) {
+    const auto interaction = impl_->interaction.render_use_state();
+    for(const RectF& region : impl_->regions.snapshot()) {
         RectF pixels{impl_->horizontal_axis->coord_to_pixel(region.x), impl_->vertical_axis->coord_to_pixel(region.y), impl_->horizontal_axis->coord_to_pixel(region.right()) - impl_->horizontal_axis->coord_to_pixel(region.x), impl_->vertical_axis->coord_to_pixel(region.bottom()) - impl_->vertical_axis->coord_to_pixel(region.y)};
         painter.rect(pixels, state.selection_border_pen, state.selection_brush);
         std::ostringstream text;
@@ -105,8 +107,8 @@ void Selection_Rectangle_Overlay_Control::paint(Painter& painter) {
         const RectF normalized = pixels.normalized();
         painter.text({normalized.x + 3.0, normalized.y + 3.0}, text.str(), state.label_font, state.label_pen);
     }
-    if(runtime.selecting)
-        painter.rect({runtime.selection_start.x, runtime.selection_start.y, runtime.selection_current.x - runtime.selection_start.x, runtime.selection_current.y - runtime.selection_start.y}, state.selection_border_pen, state.selection_brush);
+    if(interaction.selecting)
+        painter.rect({interaction.selection_start.x, interaction.selection_start.y, interaction.selection_current.x - interaction.selection_start.x, interaction.selection_current.y - interaction.selection_start.y}, state.selection_border_pen, state.selection_brush);
 }
 }
 }
diff --git a/render_2D/plottable/Spectrum.cpp b/render_2D/plottable/Spectrum.cpp
index 1421841..efaf7d8 100644
--- a/render_2D/plottable/Spectrum.cpp
+++ b/render_2D/plottable/Spectrum.cpp
@@ -1,5 +1,6 @@
 #include "Spectrum.h"
 #include "Curve_Sampling.h"
+#include "Plottable_Real_Time_Data.h"
 #include <algorithm>
 #include <cmath>
 #include <iomanip>
@@ -7,16 +8,18 @@
 namespace renderive {
 namespace detail {
 namespace {
-struct Spectrum_Runtime_Base {};
-struct Spectrum_Runtime {
+struct Spectrum_Frame {
     std::vector<double> samples;
     std::vector<double> maxima;
     std::vector<double> minima;
+};
+struct Spectrum_Interaction_Base {};
+struct Spectrum_Interaction {
     std::vector<double> markers;
     int selected_marker = -1;
     Hover_Tooltip_Runtime tooltip;
 };
-using Spectrum_Runtime_State = Double_State_Strategy<Spectrum_Runtime_Base, Spectrum_Runtime>;
+using Spectrum_Interaction_State = Double_State_Strategy<Spectrum_Interaction_Base, Spectrum_Interaction>;
 RectF axes_rect(const Axis_Transform& horizontal, const Axis_Transform& vertical) {
     const double x1 = horizontal.coord_to_pixel(horizontal.coordinate_range.origin);
     const double x2 = horizontal.coord_to_pixel(horizontal.coordinate_range.target);
@@ -38,80 +41,86 @@ void draw_curve(Painter& painter, std::span<const double> values, Range domain,
     }
     painter.polyline(points, pen);
 }
-double spectrum_power_at(const Spectrum_Properties& properties, const Spectrum_Runtime& runtime, double frequency, bool& ok) {
+double spectrum_power_at(const Spectrum_Properties& properties, const Spectrum_Frame& frame, double frequency, bool& ok) {
     ok = false;
-    if(runtime.samples.empty() || !properties.frequency_range.contains(frequency) || properties.frequency_range.length() == 0.0)
+    if(frame.samples.empty() || !properties.frequency_range.contains(frequency) || properties.frequency_range.length() == 0.0)
         return 0.0;
     const double normalized = (frequency - properties.frequency_range.origin) / properties.frequency_range.length();
-    const double position = std::clamp(normalized, 0.0, 1.0) * static_cast<double>(runtime.samples.size() - 1);
+    const double position = std::clamp(normalized, 0.0, 1.0) * static_cast<double>(frame.samples.size() - 1);
     const auto lower = static_cast<std::size_t>(std::floor(position));
-    const auto upper = std::min(lower + 1, runtime.samples.size() - 1);
+    const auto upper = std::min(lower + 1, frame.samples.size() - 1);
     const double fraction = position - static_cast<double>(lower);
     ok = true;
-    return runtime.samples[lower] * (1.0 - fraction) + runtime.samples[upper] * fraction;
+    return frame.samples[lower] * (1.0 - fraction) + frame.samples[upper] * fraction;
 }
 }
 struct Spectrum_Control::Impl {
-    Impl(std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Axis> power) : frequency_axis(std::move(frequency)), power_axis(std::move(power)) {}
+    Impl(Spectrum_Control& owner, std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Axis> power)
+        : frequency_axis(std::move(frequency)), power_axis(std::move(power)), frame(observe_real_time_data(owner)) {}
     std::shared_ptr<Frequency_Axis> frequency_axis;
     std::shared_ptr<Axis> power_axis;
-    Spectrum_Runtime_State runtime;
+    Plottable_Latest_Real_Time_Data<Spectrum_Frame> frame;
+    Spectrum_Interaction_State interaction;
+    std::mutex frame_update_mutex;
 };
 Spectrum_Control::Spectrum_Control(Plot_Core& plot, const Spectrum_Properties& properties, std::shared_ptr<Frequency_Axis> frequency_axis, std::shared_ptr<Axis> power_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(frequency_axis), std::move(power_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(frequency_axis), std::move(power_axis))) {}
 Spectrum_Control::~Spectrum_Control() = default;
 void Spectrum_Control::update_samples(std::span<const double> values) {
     if(get<&Spectrum_Properties::frequency_point_size>() <= 0)
         set<&Spectrum_Properties::frequency_point_size>(static_cast<int>(values.size()));
-    impl_->runtime.update([values](Spectrum_Runtime& runtime) {
-        runtime.samples.assign(values.begin(), values.end());
-        if(runtime.maxima.size() != values.size())
-            runtime.maxima.assign(values.begin(), values.end());
-        else
-            for(std::size_t index = 0; index < values.size(); ++index)
-                runtime.maxima[index] = std::max(runtime.maxima[index], values[index]);
-        if(runtime.minima.size() != values.size())
-            runtime.minima.assign(values.begin(), values.end());
-        else
-            for(std::size_t index = 0; index < values.size(); ++index)
-                runtime.minima[index] = std::min(runtime.minima[index], values[index]);
-    });
+    std::lock_guard lock(impl_->frame_update_mutex);
+    Spectrum_Frame frame = impl_->frame.snapshot().value_or(Spectrum_Frame{});
+    frame.samples.assign(values.begin(), values.end());
+    if(frame.maxima.size() != values.size())
+        frame.maxima.assign(values.begin(), values.end());
+    else
+        for(std::size_t index = 0; index < values.size(); ++index)
+            frame.maxima[index] = std::max(frame.maxima[index], values[index]);
+    if(frame.minima.size() != values.size())
+        frame.minima.assign(values.begin(), values.end());
+    else
+        for(std::size_t index = 0; index < values.size(); ++index)
+            frame.minima[index] = std::min(frame.minima[index], values[index]);
+    impl_->frame.update(std::move(frame));
     changed();
 }
 void Spectrum_Control::update_samples(std::pmr::vector<double>&& values) {
     update_samples(std::span<const double>(values.data(), values.size()));
 }
 std::size_t Spectrum_Control::sample_count() const {
-    return impl_->runtime.read([](const Spectrum_Runtime& runtime) { return runtime.samples.size(); });
+    const auto frame = impl_->frame.snapshot();
+    return frame ? frame->samples.size() : 0;
 }
 std::size_t Spectrum_Control::rendered_point_count() const {
     const auto state = properties();
-    const auto runtime = impl_->runtime.read([](const Spectrum_Runtime& value) { return value; });
-    return curve_points(runtime.samples, state.frequency_range, impl_->frequency_axis->transform(), impl_->power_axis->transform(), state.visible_range_only, state.interpolation_mode).size();
+    const auto frame = impl_->frame.snapshot();
+    return frame ? curve_points(frame->samples, state.frequency_range, impl_->frequency_axis->transform(), impl_->power_axis->transform(), state.visible_range_only, state.interpolation_mode).size() : 0;
 }
 double Spectrum_Control::power_at(double frequency, bool& ok) const {
     const auto state = properties();
-    return impl_->runtime.read([&](const Spectrum_Runtime& runtime) { return spectrum_power_at(state, runtime, frequency, ok); });
+    const auto frame = impl_->frame.snapshot();
+    return frame ? spectrum_power_at(state, *frame, frequency, ok) : (ok = false, 0.0);
 }
 void Spectrum_Control::add_custom_marker(double frequency) {
     add_custom_line_marker(frequency);
 }
 void Spectrum_Control::add_custom_line_marker(double frequency) {
-    impl_->runtime.update([frequency](Spectrum_Runtime& runtime) { runtime.markers.push_back(frequency); });
+    impl_->interaction.update([frequency](Spectrum_Interaction& interaction) { interaction.markers.push_back(frequency); });
     changed();
 }
 void Spectrum_Control::remove_custom_marker(double frequency) {
     bool removed{};
-    impl_->runtime.update([&](Spectrum_Runtime& runtime) {
-        if(runtime.markers.empty())
+    impl_->interaction.update([&](Spectrum_Interaction& interaction) {
+        if(interaction.markers.empty())
             return;
-        auto closest = std::min_element(runtime.markers.begin(), runtime.markers.end(), [frequency](double left, double right) { return std::abs(left - frequency) < std::abs(right - frequency); });
-        const int removed_index = static_cast<int>(std::distance(runtime.markers.begin(), closest));
-        runtime.markers.erase(closest);
-        if(runtime.selected_marker == removed_index)
-            runtime.selected_marker = -1;
-        else if(runtime.selected_marker > removed_index)
-            --runtime.selected_marker;
+        auto closest = std::min_element(interaction.markers.begin(), interaction.markers.end(), [frequency](double left, double right) { return std::abs(left - frequency) < std::abs(right - frequency); });
+        const int removed_index = static_cast<int>(std::distance(interaction.markers.begin(), closest));
+        interaction.markers.erase(closest);
+        if(interaction.selected_marker == removed_index)
+            interaction.selected_marker = -1;
+        else if(interaction.selected_marker > removed_index)
+            --interaction.selected_marker;
         removed = true;
     });
     if(removed)
@@ -119,48 +128,48 @@ void Spectrum_Control::remove_custom_marker(double frequency) {
 }
 void Spectrum_Control::remove_selected_marker() {
     bool removed{};
-    impl_->runtime.update([&](Spectrum_Runtime& runtime) {
-        if(runtime.selected_marker < 0 || runtime.selected_marker >= static_cast<int>(runtime.markers.size()))
+    impl_->interaction.update([&](Spectrum_Interaction& interaction) {
+        if(interaction.selected_marker < 0 || interaction.selected_marker >= static_cast<int>(interaction.markers.size()))
             return;
-        runtime.markers.erase(runtime.markers.begin() + runtime.selected_marker);
-        runtime.selected_marker = -1;
+        interaction.markers.erase(interaction.markers.begin() + interaction.selected_marker);
+        interaction.selected_marker = -1;
         removed = true;
     });
     if(removed)
         changed();
 }
 void Spectrum_Control::clear_custom_markers() {
-    impl_->runtime.update([](Spectrum_Runtime& runtime) {
-        runtime.markers.clear();
-        runtime.selected_marker = -1;
+    impl_->interaction.update([](Spectrum_Interaction& interaction) {
+        interaction.markers.clear();
+        interaction.selected_marker = -1;
     });
     changed();
 }
 int Spectrum_Control::selectable_line_marker_count() const {
-    return impl_->runtime.read([](const Spectrum_Runtime& runtime) { return static_cast<int>(runtime.markers.size()); });
+    return impl_->interaction.read([](const Spectrum_Interaction& interaction) { return static_cast<int>(interaction.markers.size()); });
 }
 int Spectrum_Control::selected_marker_index() const {
-    return impl_->runtime.get<&Spectrum_Runtime::selected_marker>();
+    return impl_->interaction.get<&Spectrum_Interaction::selected_marker>();
 }
 void Spectrum_Control::set_selected_marker_index(int index) {
-    impl_->runtime.update([index](Spectrum_Runtime& runtime) { runtime.selected_marker = index >= 0 && index < static_cast<int>(runtime.markers.size()) ? index : -1; });
+    impl_->interaction.update([index](Spectrum_Interaction& interaction) { interaction.selected_marker = index >= 0 && index < static_cast<int>(interaction.markers.size()) ? index : -1; });
     changed();
 }
 void Spectrum_Control::select_next_marker() {
-    impl_->runtime.update([](Spectrum_Runtime& runtime) {
-        if(runtime.markers.empty())
-            runtime.selected_marker = -1;
+    impl_->interaction.update([](Spectrum_Interaction& interaction) {
+        if(interaction.markers.empty())
+            interaction.selected_marker = -1;
         else
-            runtime.selected_marker = (runtime.selected_marker + 1) % static_cast<int>(runtime.markers.size());
+            interaction.selected_marker = (interaction.selected_marker + 1) % static_cast<int>(interaction.markers.size());
     });
     changed();
 }
 void Spectrum_Control::select_previous_marker() {
-    impl_->runtime.update([](Spectrum_Runtime& runtime) {
-        if(runtime.markers.empty())
-            runtime.selected_marker = -1;
+    impl_->interaction.update([](Spectrum_Interaction& interaction) {
+        if(interaction.markers.empty())
+            interaction.selected_marker = -1;
         else
-            runtime.selected_marker = (runtime.selected_marker <= 0 ? static_cast<int>(runtime.markers.size()) : runtime.selected_marker) - 1;
+            interaction.selected_marker = (interaction.selected_marker <= 0 ? static_cast<int>(interaction.markers.size()) : interaction.selected_marker) - 1;
     });
     changed();
 }
@@ -168,14 +177,14 @@ void Spectrum_Control::clear_marker_selection() {
     set_selected_marker_index(-1);
 }
 double Spectrum_Control::marker_frequency(int index) const {
-    return impl_->runtime.read([index](const Spectrum_Runtime& runtime) { return index >= 0 && index < static_cast<int>(runtime.markers.size()) ? runtime.markers[index] : 0.0; });
+    return impl_->interaction.read([index](const Spectrum_Interaction& interaction) { return index >= 0 && index < static_cast<int>(interaction.markers.size()) ? interaction.markers[index] : 0.0; });
 }
 void Spectrum_Control::set_marker_frequency(int index, double frequency) {
     bool updated{};
-    impl_->runtime.update([&](Spectrum_Runtime& runtime) {
-        if(index < 0 || index >= static_cast<int>(runtime.markers.size()))
+    impl_->interaction.update([&](Spectrum_Interaction& interaction) {
+        if(index < 0 || index >= static_cast<int>(interaction.markers.size()))
             return;
-        runtime.markers[index] = frequency;
+        interaction.markers[index] = frequency;
         updated = true;
     });
     if(updated)
@@ -188,17 +197,18 @@ void Spectrum_Control::set_current_marker_frequency(double frequency) {
 }
 void Spectrum_Control::handle_event(const Event& event) {
     bool updated{};
-    impl_->runtime.update([&](Spectrum_Runtime& runtime) { updated = update_hover_tooltip(runtime.tooltip, event); });
+    impl_->interaction.update([&](Spectrum_Interaction& interaction) { updated = update_hover_tooltip(interaction.tooltip, event); });
     if(updated)
         changed();
 }
 void Spectrum_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
+    impl_->interaction.publish();
 }
 void Spectrum_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
+    const Spectrum_Frame frame = impl_->frame.snapshot().value_or(Spectrum_Frame{});
+    const auto interaction = impl_->interaction.render_use_state();
     const Axis_Transform horizontal = impl_->frequency_axis->transform();
     const Axis_Transform vertical = impl_->power_axis->transform();
     const RectF content = axes_rect(horizontal, vertical);
@@ -208,23 +218,23 @@ void Spectrum_Control::paint(Painter& painter) {
         painter.rect({std::min(first, last), content.y, std::abs(last - first), content.height}, Pen{.style = Line_Style::None}, state.sweep_region_brush);
     }
     if(state.max_hold_visible)
-        draw_curve(painter, runtime.maxima, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.max_pen, state.max_brush);
+        draw_curve(painter, frame.maxima, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.max_pen, state.max_brush);
     if(state.min_hold_visible)
-        draw_curve(painter, runtime.minima, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.min_pen, state.min_brush);
-    draw_curve(painter, runtime.samples, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.current_pen, state.current_brush);
+        draw_curve(painter, frame.minima, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.min_pen, state.min_brush);
+    draw_curve(painter, frame.samples, state.frequency_range, horizontal, vertical, state.visible_range_only, state.interpolation_mode, state.current_pen, state.current_brush);
     if(state.middle_frequency_pen.enabled()) {
         const double x = horizontal.coord_to_pixel(state.center_frequency);
         painter.line({x, content.y}, {x, content.bottom()}, state.middle_frequency_pen);
     }
-    for(std::size_t index = 0; index < runtime.markers.size(); ++index) {
-        const double x = horizontal.coord_to_pixel(runtime.markers[index]);
-        painter.line({x, content.y}, {x, content.bottom()}, static_cast<int>(index) == runtime.selected_marker ? state.selected_marker_pen : state.marker_pen);
+    for(std::size_t index = 0; index < interaction.markers.size(); ++index) {
+        const double x = horizontal.coord_to_pixel(interaction.markers[index]);
+        painter.line({x, content.y}, {x, content.bottom()}, static_cast<int>(index) == interaction.selected_marker ? state.selected_marker_pen : state.marker_pen);
     }
-    if(!runtime.samples.empty() && (state.max_marker_visible || state.use_min_marker)) {
+    if(!frame.samples.empty() && (state.max_marker_visible || state.use_min_marker)) {
         const auto draw_extreme = [&](bool maximum) {
-            auto iterator = maximum ? std::max_element(runtime.samples.begin(), runtime.samples.end()) : std::min_element(runtime.samples.begin(), runtime.samples.end());
-            const std::size_t index = static_cast<std::size_t>(std::distance(runtime.samples.begin(), iterator));
-            const double denominator = runtime.samples.size() > 1 ? runtime.samples.size() - 1.0 : 1.0;
+            auto iterator = maximum ? std::max_element(frame.samples.begin(), frame.samples.end()) : std::min_element(frame.samples.begin(), frame.samples.end());
+            const std::size_t index = static_cast<std::size_t>(std::distance(frame.samples.begin(), iterator));
+            const double denominator = frame.samples.size() > 1 ? frame.samples.size() - 1.0 : 1.0;
             const double frequency = state.frequency_range.origin + state.frequency_range.length() * index / denominator;
             const PointF point{horizontal.coord_to_pixel(frequency), vertical.coord_to_pixel(*iterator)};
             const Pen& pen = maximum ? state.max_pen : state.min_pen;
@@ -235,14 +245,14 @@ void Spectrum_Control::paint(Painter& painter) {
         if(state.use_min_marker)
             draw_extreme(false);
     }
-    if(state.tooltip_enabled && runtime.tooltip.active && content.contains(runtime.tooltip.position)) {
-        const double frequency = horizontal.pixel_to_coord(runtime.tooltip.position.x);
+    if(state.tooltip_enabled && interaction.tooltip.active && content.contains(interaction.tooltip.position)) {
+        const double frequency = horizontal.pixel_to_coord(interaction.tooltip.position.x);
         bool ok{};
-        const double power = spectrum_power_at(state, runtime, frequency, ok);
+        const double power = spectrum_power_at(state, frame, frequency, ok);
         if(ok) {
             std::ostringstream text;
             text << std::fixed << std::setprecision(2) << frequency << " Hz  " << power;
-            const RectF box{runtime.tooltip.position.x + 8.0, runtime.tooltip.position.y + 8.0, 170.0, 24.0};
+            const RectF box{interaction.tooltip.position.x + 8.0, interaction.tooltip.position.y + 8.0, 170.0, 24.0};
             painter.rect(box, Pen{state.tooltip_text_pen.color}, state.tooltip_background_brush);
             painter.text({box.x + 4.0, box.y + 3.0}, text.str(), state.tooltip_font, state.tooltip_text_pen);
         }
diff --git a/render_2D/plottable/Sweep_Spectrum.cpp b/render_2D/plottable/Sweep_Spectrum.cpp
index de15c29..e13b2ae 100644
--- a/render_2D/plottable/Sweep_Spectrum.cpp
+++ b/render_2D/plottable/Sweep_Spectrum.cpp
@@ -1,5 +1,6 @@
 #include "Sweep_Spectrum.h"
 #include "Curve_Sampling.h"
+#include "Plottable_Real_Time_Data.h"
 #include "../render/Blend2D_Cache.h"
 #include <algorithm>
 #include <cmath>
@@ -7,11 +8,7 @@
 namespace renderive {
 namespace detail {
 namespace {
-struct Sweep_Spectrum_Runtime_Base {};
-struct Sweep_Spectrum_Runtime {
-    std::deque<std::vector<double>> blocks;
-};
-using Sweep_Spectrum_Runtime_State = Double_State_Strategy<Sweep_Spectrum_Runtime_Base, Sweep_Spectrum_Runtime>;
+using Sweep_Spectrum_History = Plottable_History_Real_Time_Data<std::vector<double>, std::deque<std::vector<double>>>;
 RectF axis_content_rect(const Axis_Transform& horizontal, const Axis_Transform& vertical) {
     const double x1 = horizontal.coord_to_pixel(horizontal.coordinate_range.origin);
     const double x2 = horizontal.coord_to_pixel(horizontal.coordinate_range.target);
@@ -19,72 +16,63 @@ RectF axis_content_rect(const Axis_Transform& horizontal, const Axis_Transform&
     const double y2 = vertical.coord_to_pixel(vertical.coordinate_range.target);
     return {std::min(x1, x2), std::min(y1, y2), std::abs(x2 - x1), std::abs(y2 - y1)};
 }
-std::vector<double> flatten(const Sweep_Spectrum_Runtime& runtime) {
+std::vector<double> flatten(const std::deque<std::vector<double>>& blocks) {
     std::vector<double> values;
-    for(const auto& block : runtime.blocks)
+    for(const auto& block : blocks)
         values.insert(values.end(), block.begin(), block.end());
     return values;
 }
 }
 struct Sweep_Spectrum_Control::Impl {
-    Impl(std::shared_ptr<Axis> frequency, std::shared_ptr<Axis> power) : frequency_axis(std::move(frequency)), power_axis(std::move(power)) {}
+    Impl(Sweep_Spectrum_Control& owner, std::shared_ptr<Axis> frequency, std::shared_ptr<Axis> power)
+        : frequency_axis(std::move(frequency)), power_axis(std::move(power)), blocks(observe_real_time_data(owner)) {}
     std::shared_ptr<Axis> frequency_axis;
     std::shared_ptr<Axis> power_axis;
-    Sweep_Spectrum_Runtime_State runtime;
+    Sweep_Spectrum_History blocks;
 };
 Sweep_Spectrum_Control::Sweep_Spectrum_Control(Plot_Core& plot, const Sweep_Spectrum_Properties& properties, std::shared_ptr<Axis> frequency_axis, std::shared_ptr<Axis> power_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(frequency_axis), std::move(power_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(frequency_axis), std::move(power_axis))) {}
 Sweep_Spectrum_Control::~Sweep_Spectrum_Control() = default;
 void Sweep_Spectrum_Control::append_block(std::span<const double> values) {
     if(get<&Sweep_Spectrum_Properties::bins_per_block>() <= 0)
         set<&Sweep_Spectrum_Properties::bins_per_block>(static_cast<int>(values.size()));
     const int limit = get<&Sweep_Spectrum_Properties::block_count>();
-    impl_->runtime.update([values, limit](Sweep_Spectrum_Runtime& runtime) {
-        runtime.blocks.emplace_back(values.begin(), values.end());
-        while(runtime.blocks.size() > static_cast<std::size_t>(limit))
-            runtime.blocks.pop_front();
-    });
+    impl_->blocks.update({values.begin(), values.end()}, static_cast<std::size_t>(limit));
     changed();
 }
 void Sweep_Spectrum_Control::append_block(std::pmr::vector<double>&& values) {
     append_block(std::span<const double>(values.data(), values.size()));
 }
 std::size_t Sweep_Spectrum_Control::stored_block_count() const {
-    return impl_->runtime.read([](const Sweep_Spectrum_Runtime& runtime) { return runtime.blocks.size(); });
+    return impl_->blocks.size();
 }
 std::size_t Sweep_Spectrum_Control::stored_point_count() const {
-    return impl_->runtime.read([](const Sweep_Spectrum_Runtime& runtime) {
-        std::size_t count{};
-        for(const auto& block : runtime.blocks)
-            count += block.size();
-        return count;
-    });
+    const auto blocks = impl_->blocks.snapshot();
+    std::size_t count{};
+    for(const auto& block : blocks)
+        count += block.size();
+    return count;
 }
 std::size_t Sweep_Spectrum_Control::rendered_point_count() const {
     const auto state = properties();
-    const auto runtime = impl_->runtime.read([](const Sweep_Spectrum_Runtime& value) { return value; });
-    const auto values = flatten(runtime);
+    const auto values = flatten(impl_->blocks.snapshot());
     return curve_points(values, state.frequency_range, impl_->frequency_axis->transform(), impl_->power_axis->transform(), state.visible_range_only, state.interpolation_mode).size();
 }
 void Sweep_Spectrum_Control::publish() {
     publish_properties();
     const int limit = get<&Sweep_Spectrum_Properties::block_count>();
-    impl_->runtime.update([limit](Sweep_Spectrum_Runtime& runtime) {
-        while(runtime.blocks.size() > static_cast<std::size_t>(limit))
-            runtime.blocks.pop_front();
-    });
-    impl_->runtime.publish();
+    impl_->blocks.retain_latest(static_cast<std::size_t>(limit));
 }
 void Sweep_Spectrum_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
-    const auto values = flatten(runtime);
+    const auto blocks = impl_->blocks.snapshot();
+    const auto values = flatten(blocks);
     if(values.size() < 2)
         return;
     const Axis_Transform x = impl_->frequency_axis->transform();
     const Axis_Transform y = impl_->power_axis->transform();
     painter.polyline(curve_points(values, state.frequency_range, x, y, state.visible_range_only, state.interpolation_mode), state.pen);
-    const double completed = std::min(1.0, static_cast<double>(runtime.blocks.size()) / state.block_count.get());
+    const double completed = std::min(1.0, static_cast<double>(blocks.size()) / state.block_count.get());
     const double frequency = state.frequency_range.origin + state.frequency_range.length() * completed;
     const RectF content = axis_content_rect(x, y);
     const double marker_x = x.coord_to_pixel(frequency);
diff --git a/render_2D/plottable/Waterfall.cpp b/render_2D/plottable/Waterfall.cpp
index 650ef5b..7b8cc90 100644
--- a/render_2D/plottable/Waterfall.cpp
+++ b/render_2D/plottable/Waterfall.cpp
@@ -1,5 +1,6 @@
 #include "Waterfall.h"
 #include "Heatmap_Utils.h"
+#include "Plottable_Real_Time_Data.h"
 #include <algorithm>
 #include <deque>
 #include <iomanip>
@@ -11,31 +12,29 @@ struct Waterfall_Row {
     int tick{};
     std::vector<double> values;
 };
-struct Waterfall_Runtime_Base {};
-struct Waterfall_Runtime {
-    std::deque<Waterfall_Row> rows;
+struct Waterfall_Interaction_Base {};
+struct Waterfall_Interaction {
     Hover_Tooltip_Runtime tooltip;
 };
-using Waterfall_Runtime_State = Double_State_Strategy<Waterfall_Runtime_Base, Waterfall_Runtime>;
+using Waterfall_History = Plottable_History_Real_Time_Data<Waterfall_Row, std::deque<Waterfall_Row>>;
+using Waterfall_Interaction_State = Double_State_Strategy<Waterfall_Interaction_Base, Waterfall_Interaction>;
 }
 struct Waterfall_Control::Impl {
-    Impl(std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Time_Axis> time) : frequency_axis(std::move(frequency)), time_axis(std::move(time)) {}
+    Impl(Waterfall_Control& owner, std::shared_ptr<Frequency_Axis> frequency, std::shared_ptr<Time_Axis> time)
+        : frequency_axis(std::move(frequency)), time_axis(std::move(time)), rows(observe_real_time_data(owner)) {}
     std::shared_ptr<Frequency_Axis> frequency_axis;
     std::shared_ptr<Time_Axis> time_axis;
-    Waterfall_Runtime_State runtime;
+    Waterfall_History rows;
+    Waterfall_Interaction_State interaction;
 };
 Waterfall_Control::Waterfall_Control(Plot_Core& plot, const Waterfall_Properties& properties, std::shared_ptr<Frequency_Axis> frequency_axis, std::shared_ptr<Time_Axis> time_axis)
-    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(std::move(frequency_axis), std::move(time_axis))) {}
+    : Plottable_State(plot, properties), impl_(std::make_unique<Impl>(*this, std::move(frequency_axis), std::move(time_axis))) {}
 Waterfall_Control::~Waterfall_Control() = default;
 void Waterfall_Control::append_row(int tick, std::span<const double> values) {
     const std::size_t limit = static_cast<std::size_t>(std::max(2, impl_->time_axis->visible_time_point_count()));
     if(get<&Waterfall_Properties::frequency_bin_count>() <= 0)
         set<&Waterfall_Properties::frequency_bin_count>(static_cast<int>(values.size()));
-    impl_->runtime.update([tick, values, limit](Waterfall_Runtime& runtime) {
-        runtime.rows.push_back({tick, {values.begin(), values.end()}});
-        while(runtime.rows.size() > limit)
-            runtime.rows.pop_front();
-    });
+    impl_->rows.update({tick, {values.begin(), values.end()}}, limit);
     changed();
 }
 void Waterfall_Control::append_row(int tick, std::pmr::vector<double>&& values) {
@@ -48,44 +47,44 @@ void Waterfall_Control::append_row(Time_Of_Day time, std::pmr::vector<double>&&
     append_row(time, std::span<const double>(values.data(), values.size()));
 }
 std::size_t Waterfall_Control::row_count() const {
-    return impl_->runtime.read([](const Waterfall_Runtime& runtime) { return runtime.rows.size(); });
+    return impl_->rows.size();
 }
 std::size_t Waterfall_Control::stored_point_count() const {
-    return impl_->runtime.read([](const Waterfall_Runtime& runtime) {
-        std::size_t count{};
-        for(const auto& row : runtime.rows)
-            count += row.values.size();
-        return count;
-    });
+    const auto rows = impl_->rows.snapshot();
+    std::size_t count{};
+    for(const auto& row : rows)
+        count += row.values.size();
+    return count;
 }
 std::size_t Waterfall_Control::rendered_cell_count() const {
     const auto state = properties();
-    const auto runtime = impl_->runtime.read([](const Waterfall_Runtime& value) { return value; });
-    if(runtime.rows.empty())
+    const auto rows = impl_->rows.snapshot();
+    if(rows.empty())
         return 0;
-    const int source_width = std::min(state.frequency_bin_count.get(), static_cast<int>(std::min_element(runtime.rows.begin(), runtime.rows.end(), [](const auto& left, const auto& right) { return left.values.size() < right.values.size(); })->values.size()));
+    const int source_width = std::min(state.frequency_bin_count.get(), static_cast<int>(std::min_element(rows.begin(), rows.end(), [](const auto& left, const auto& right) { return left.values.size() < right.values.size(); })->values.size()));
     if(source_width <= 0)
         return 0;
     const auto columns = frequency_columns(state.frequency_range, impl_->frequency_axis->coord_range(), source_width, state.visible_range_only);
-    return columns ? static_cast<std::size_t>(columns->last - columns->first + 1) * runtime.rows.size() : 0;
+    return columns ? static_cast<std::size_t>(columns->last - columns->first + 1) * rows.size() : 0;
 }
 void Waterfall_Control::handle_event(const Event& event) {
     bool updated{};
-    impl_->runtime.update([&](Waterfall_Runtime& runtime) { updated = update_hover_tooltip(runtime.tooltip, event); });
+    impl_->interaction.update([&](Waterfall_Interaction& interaction) { updated = update_hover_tooltip(interaction.tooltip, event); });
     if(updated)
         changed();
 }
 void Waterfall_Control::publish() {
     publish_properties();
-    impl_->runtime.publish();
+    impl_->interaction.publish();
 }
 void Waterfall_Control::paint(Painter& painter) {
     const auto state = render_properties();
-    const auto runtime = impl_->runtime.render_use_state();
-    if(runtime.rows.empty())
+    const auto rows = impl_->rows.snapshot();
+    const auto interaction = impl_->interaction.render_use_state();
+    if(rows.empty())
         return;
-    const int source_width = std::min(state.frequency_bin_count.get(), static_cast<int>(std::min_element(runtime.rows.begin(), runtime.rows.end(), [](const auto& left, const auto& right) { return left.values.size() < right.values.size(); })->values.size()));
-    const int height = static_cast<int>(runtime.rows.size());
+    const int source_width = std::min(state.frequency_bin_count.get(), static_cast<int>(std::min_element(rows.begin(), rows.end(), [](const auto& left, const auto& right) { return left.values.size() < right.values.size(); })->values.size()));
+    const int height = static_cast<int>(rows.size());
     if(source_width <= 0 || height <= 0)
         return;
     const Axis_Transform horizontal = impl_->frequency_axis->transform();
@@ -95,21 +94,21 @@ void Waterfall_Control::paint(Painter& painter) {
     const int width = columns->last - columns->first + 1;
     std::vector<Pixel> pixels(static_cast<std::size_t>(width) * height);
     for(int y = 0; y < height; ++y) {
-        const auto& row = runtime.rows[static_cast<std::size_t>(y)].values;
+        const auto& row = rows[static_cast<std::size_t>(y)].values;
         for(int x = 0; x < width; ++x)
             pixels[static_cast<std::size_t>(y) * width + x] = state.color_map.at_normalized(normalized_value(row[static_cast<std::size_t>(columns->first + x)], state.power_range));
     }
     const Axis_Transform vertical = impl_->time_axis->transform();
-    const Range time_range{static_cast<double>(runtime.rows.front().tick), static_cast<double>(runtime.rows.back().tick)};
+    const Range time_range{static_cast<double>(rows.front().tick), static_cast<double>(rows.back().tick)};
     RectF target = mapped_rect(horizontal, vertical, columns->range, time_range);
     if(target.height < 1.0)
         target.height = std::max(1.0, static_cast<double>(impl_->time_axis->pixel_length()));
     painter.heatmap(target, width, height, pixels, state.interpolation_mode);
-    if(state.tooltip_enabled && runtime.tooltip.active && target.contains(runtime.tooltip.position)) {
-        const double frequency = horizontal.pixel_to_coord(runtime.tooltip.position.x);
+    if(state.tooltip_enabled && interaction.tooltip.active && target.contains(interaction.tooltip.position)) {
+        const double frequency = horizontal.pixel_to_coord(interaction.tooltip.position.x);
         std::ostringstream text;
         text << std::fixed << std::setprecision(2) << frequency << " Hz";
-        const RectF box{runtime.tooltip.position.x + 8.0, runtime.tooltip.position.y + 8.0, 110.0, 24.0};
+        const RectF box{interaction.tooltip.position.x + 8.0, interaction.tooltip.position.y + 8.0, 110.0, 24.0};
         painter.rect(box, Pen{state.tooltip_text_pen.color}, state.tooltip_background_brush);
         painter.text({box.x + 4.0, box.y + 3.0}, text.str(), state.tooltip_font, state.tooltip_text_pen);
     }
diff --git a/render_2D/tests/render_2D_Integration_Tests.cpp b/render_2D/tests/render_2D_Integration_Tests.cpp
index 0cd689f..7cd20b5 100644
--- a/render_2D/tests/render_2D_Integration_Tests.cpp
+++ b/render_2D/tests/render_2D_Integration_Tests.cpp
@@ -563,5 +563,26 @@ TEST(Renderive_Core2, PlottablePropertiesPublishOnlyAtFrameBoundary) {
     EXPECT_EQ(state->state_revision(), 1U);
     ASSERT_TRUE(plot.render_prepared_frame());
 }
+TEST(Renderive_Core2, PlottableDataUpdatesReachKernelRealTimeDataStrategy) {
+    Plot_Core plot;
+    plot.init();
+    const auto root = plot.root_renderable();
+    const auto frequency = Frequency_Axis::Builder(root, Orientation::Horizontal).build();
+    const auto power = Axis::Builder(root, Orientation::Vertical).build();
+    const auto spectrum = Spectrum::Builder{}.build(root, frequency, power);
+    const auto afterglow = Afterglow::Builder{}.build(root, frequency, power);
+    ASSERT_TRUE(spectrum);
+    ASSERT_TRUE(afterglow);
+    const auto before = plot.frame_observer_snapshot().observation_count;
+    const std::array samples{-80.0, -70.0, -60.0, -50.0};
+    spectrum->update_samples(samples);
+    const auto latest = plot.frame_observer_snapshot();
+    EXPECT_EQ(latest.last_event, "real_time_data_updated");
+    EXPECT_GT(latest.observation_count, before);
+    afterglow->append_spectrum(samples);
+    const auto history = plot.frame_observer_snapshot();
+    EXPECT_EQ(history.last_event, "real_time_data_updated");
+    EXPECT_GT(history.observation_count, latest.observation_count);
+}
 } // namespace
 } // namespace renderive
diff --git a/web_server/app/Gallery_Plot_Session.cpp b/web_server/app/Gallery_Plot_Session.cpp
index cc247b8..7b260ac 100644
--- a/web_server/app/Gallery_Plot_Session.cpp
+++ b/web_server/app/Gallery_Plot_Session.cpp
@@ -1823,7 +1823,7 @@ struct Gallery_Plot_Session::Impl {
                 Web_Response_Type::Json,
                 Gallery_Protocol::case_json(id, scene->state(),
                                             scene->telemetry_json(),
-                                            "Renderable 已移除并通过 Builder 重建", mode)
+                                            "Renderable 已移除并按属性重建", mode)
             };
         }
         bool recognized{};
diff --git a/web_server/app/Gallery_Protocol.cpp b/web_server/app/Gallery_Protocol.cpp
index 56cb3fa..098ac3c 100644
--- a/web_server/app/Gallery_Protocol.cpp
+++ b/web_server/app/Gallery_Protocol.cpp
@@ -59,11 +59,11 @@ const std::vector<Case_Model>& cases() {
         {"waterfall", "瀑布图", "Waterfall", "热力图控件",
          "逐行时频热力图；Nearest、Bilinear、Bicubic 三种图像模式均可切换。", 50},
         {"frequency_trace", "时间轨迹", "Frequency_Trace", "曲线控件",
-         "Time_Axis 驱动的连续轨迹，覆盖时间格式和 Builder 笔刷 API。", 60},
+         "Time_Axis 驱动的连续轨迹，覆盖时间格式和属性化笔刷 API。", 60},
         {"selection_overlay", "框选叠层", "Selection_Rectangle_Overlay", "交互控件",
-         "鼠标框选、多区域保留、标注样式、清空与轴重新绑定。", 70},
+         "鼠标框选、多区域保留、标注样式和清空。", 70},
         {"constellation", "星座图", "Constellation_Diagram", "点图控件",
-         "PSK4/PSK8/PSK16 Builder 模式、相位、寿命、坐标范围和方形拟合。", 80}
+         "PSK4/PSK8/PSK16 模式、相位、寿命、坐标范围和方形拟合。", 80}
     };
     return value;
 }
diff --git a/web_server/tests/Web_Bridge_Tests.cpp b/web_server/tests/Web_Bridge_Tests.cpp
index 7b4cbc8..2529b78 100644
--- a/web_server/tests/Web_Bridge_Tests.cpp
+++ b/web_server/tests/Web_Bridge_Tests.cpp
@@ -259,8 +259,8 @@ TEST(RenderiveWebGallery, BackendMenuMapsRetainedControlApis) {
         for (const auto mode : modes) {
             const auto contract = parse_json(Gallery_Protocol::case_json(
                 case_id, Gallery_Protocol::default_state(case_id, mode), "{}", {}, mode));
-            for (const auto& control : contract.at("controls").at("data"))
-                api_text += control.at("api").get<std::string>() + '\n';
+            for (const auto& control : contract.at("controls").at("descriptor").at("fields"))
+                api_text += control.at("presentation").at("description").get<std::string>() + '\n';
             for (const auto& action : contract.at("actions").at("data"))
                 api_text += action.at("api").get<std::string>() + '\n';
         }
@@ -497,57 +497,53 @@ TEST(RenderiveWebGallery, EveryPublishedControlAppliesToTheLiveCore2Scene) {
             auto state = response_json(session.handle(gallery_request(
                 Gallery_Request_Kind::Open, open_message(case_id, mode))));
             ASSERT_EQ(state.at("type"), "case_state");
-            const auto published_controls = state.at("controls").at("data");
+            const auto published_controls = state.at("controls").at("descriptor").at("fields");
             for (const auto& published : published_controls) {
                 ++applied_control_instances;
-                const std::string id = published.at("id");
+                const std::string id = published.at("name");
                 SCOPED_TRACE(std::string(case_id) + "/" + std::string(mode) + "/" + id);
-                const std::string input = published.at("input");
+                const std::string input = published.at("presentation").at("control");
+                const auto& current_value = state.at("controls").at("data").at(id);
                 nlohmann::json alternative;
                 if (input == "boolean") {
-                    alternative = !published.at("value").get<bool>();
+                    alternative = !current_value.get<bool>();
                 } else if (input == "number") {
                     const double minimum = published.at("minimum");
                     const double maximum = published.at("maximum");
-                    const double current = published.at("value");
-                    const double step = std::max(published.at("step").get<double>(), 1e-9);
+                    const double current = current_value;
+                    const double step = std::max(published.at("multiple_of").get<double>(), 1e-9);
                     double value = current + step;
                     if (value > maximum)
                         value = current - step;
                     if (value < minimum || value == current)
                         value = current == minimum ? maximum : minimum;
-                    if (published.at("integer").get<bool>())
+                    const bool integer = published.at("value_type") == "integer";
+                    if (integer)
                         value = std::round(value);
-                    alternative = value;
+                    alternative = integer ? nlohmann::json(static_cast<std::int64_t>(std::llround(value))) : nlohmann::json(value);
                 } else if (input == "select") {
-                    const auto& options = published.at("options");
-                    const std::string current = published.at("value");
+                    const auto& options = published.at("presentation").at("options");
+                    const std::string current = current_value;
                     const auto selected = std::find_if(
                         options.begin(), options.end(), [&current](const auto& option) {
-                            return option.template get<std::string>() != current;
+                            return option.at("value").template get<std::string>() != current;
                         });
                     ASSERT_NE(selected, options.end());
-                    alternative = *selected;
+                    alternative = selected->at("value");
                 } else if (input == "color") {
-                    alternative = published.at("value") == "#123456" ? "#654321" : "#123456";
+                    alternative = current_value == "#123456" ? "#654321" : "#123456";
                 } else {
                     ASSERT_EQ(input, "text");
-                    alternative = published.at("value").get<std::string>() + "_live";
+                    alternative = current_value.get<std::string>() + "_live";
                 }
 
                 nlohmann::json request{{"category", "event"}, {"type", "gallery_patch"},
                                        {"patch", {{id, alternative}}}};
                 state = response_json(session.handle(gallery_request(
                     Gallery_Request_Kind::Patch, request.dump())));
-                ASSERT_EQ(state.at("type"), "case_state");
+                ASSERT_EQ(state.at("type"), "case_state") << state.dump();
                 EXPECT_EQ(state.at("frame_mode").at("id").get<std::string>(), mode);
-                const auto& returned = state.at("controls").at("data");
-                const auto found = std::find_if(returned.begin(), returned.end(),
-                                                [&id](const auto& item) {
-                                                    return item.at("id") == id;
-                                                });
-                ASSERT_NE(found, returned.end());
-                EXPECT_EQ(found->at("value"), alternative);
+                EXPECT_EQ(state.at("controls").at("data").at(id), alternative);
                 EXPECT_TRUE(state.at("telemetry").contains("kernel_observer"));
             }
         }
@@ -648,7 +644,7 @@ TEST(RenderiveWebGallery, CommonControlsAndViewLifecycleProduceObservableEffects
               "case_state");
 
     const auto background_state = patch_controls(session, {{"background_color", "#123456"}});
-    EXPECT_EQ(background_state.at("controls").at("data").at(0).at("value"), "#123456");
+    EXPECT_EQ(background_state.at("controls").at("data").at("background_color"), "#123456");
     ASSERT_EQ(invoke_action(session, "mode_cycle").at("type"), "case_state");
     const auto background_frame = session.handle(Frame_Request{});
     ASSERT_TRUE(background_frame.has_value());
@@ -1443,7 +1439,7 @@ TEST(RenderiveWebGallery, ConstellationLowLatencyPixelsChange) {
     expect_low_latency_canvas_to_change("constellation");
 }
 
-TEST(RenderiveWebGallery, BuilderOnlyControlsRebuildAndAllImageModesRender) {
+TEST(RenderiveWebGallery, PropertyChangesRebuildAndAllImageModesRender) {
     Gallery_Plot_Session constellation;
     ASSERT_TRUE(constellation.handle(gallery_request(
         Gallery_Request_Kind::Open,
@@ -1453,12 +1449,7 @@ TEST(RenderiveWebGallery, BuilderOnlyControlsRebuildAndAllImageModesRender) {
         R"({"category":"event","type":"gallery_patch","patch":{"constellation_type":"PSK16","phase_offset":0.75}})"));
     ASSERT_TRUE(rebuilt.has_value());
     const auto rebuilt_json = parse_json(rebuilt->payload);
-    const auto& rebuilt_controls = rebuilt_json.at("controls").at("data");
-    const auto type = std::find_if(rebuilt_controls.begin(), rebuilt_controls.end(), [](const auto& item) {
-        return item.at("id") == "constellation_type";
-    });
-    ASSERT_NE(type, rebuilt_controls.end());
-    EXPECT_EQ(type->at("value"), "PSK16");
+    EXPECT_EQ(rebuilt_json.at("controls").at("data").at("constellation_type"), "PSK16");
     ASSERT_TRUE(constellation.handle(Frame_Request{}).has_value());
 
     Gallery_Plot_Session waterfall;