- Replace cv2.rotate() with NumPy array indexing for 2x+ speedup
- Add --display-fps argument to throttle display refresh while capturing all UDP frames
- Add --save-mjpeg argument to record rolling display to MJPEG video
- Fix display throttling to capture all frames while only refreshing display at specified rate
- Performance: ~300 FPS no-display, ~100 FPS full display, 150-250+ FPS with throttling
