whenever I run my engine in 2000, the frame rate stays high, but really jerky. I tried using timeBeginPeriod(1); CurrentTime = timeGetTime(); timeEndPeriod(1); But that made no difference (though the calls succeeded). Anyone else experienced this? Any solutions? These are the sort of times per frame I was getting... 0.203000 0.009000 0.015000 0.011000 0.010000 0.011000 0.203000 0.010000 0.010000 0.011000 0.011000 0.010000 0.200000 0.015000