The mirror renders into the host window, so the host's render frame timing is the mirror's performance. FrameStats now retains a ~2 s ring of frame-time samples; the Video mirror panel plots them as a frametime graph (0-33 ms scale) and an FPS graph (0-144 scale), each with an avg overlay, and prints avg/min/max for both frametime and FPS underneath. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>