What are the setting you are using for the compiler and what compiler? Currently I always compile for 386 processors due to the differences in pentium et al. If you use the most generic settings (not those optimal for your platform) that might change the speed issue on Athalon. Might be worth some experimentation.Thats odd. I have a 733 Mhz P3 and its running pretty good on it. I don't know why my code always has problems running on Athlons . Anyways, you can use the Backspace key to unthrottle it but there is no FPS display though. If you want, I can upload one which does.