I repeated the test on hrev44293 gcc4h. Previously: PerfTest 2: 7-16 FPS, framerate is not stable. Composite Perf Test #3: 12,2 FPS. Present: PerfTest 2: 16 FPS, stable! Composite Perf Test #3: 14,67 FPS, stable! When I cover part of the window, FPS growing! It's good that someone thought about trimming, what is not visible.