Faster Preview View (#15884)

Co-authored-by: Kris Austin <kris.austin@gmail.com>

src/slic3r/GUI/SceneBenchmark.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <vector>
+
+namespace Slic3r {
+namespace GUI {
+
+struct FrameTimeStats
+{
+    double fps{ 0.0 };
+    double average_ms{ 0.0 };
+    double median_ms{ 0.0 };
+    double p95_ms{ 0.0 };
+    double p99_ms{ 0.0 };
+    double max_ms{ 0.0 };
+};
+
+// Nearest-rank percentiles, so every value is a measured frame time.
+FrameTimeStats frame_time_stats(std::vector<double> frame_ms);
+
+// Loads the OrcaSliced Combo into a new project and turns the camera around it in Prepare, then in
+// Preview once sliced, then moves the layer slider through the layers, and reports the frame times and
+// render timings of the three scenes.
+void run_scene_benchmark();
+
+} // namespace GUI
+} // namespace Slic3r