[gameprogrammer] random speed up

It's not very often you get to complain about your game running too
fast but here it goes...

I'm making a pretty simple game using fmod for sound and directx for
everything else.

I have a wierd issue where if you enter the game and then go back to
the main menu, if you enter it again the game appears to have more CPU
priority or something and runs probably twice as fast.

The game is really simple and doesnt use any frame limiting code, and
its single threaded (except for whatever fmod may be doing).

Has anyone ever hit a problem like this before or know what it could be?

Is it something like the main game is hammering on the cpu (there are
a lot of particles) and then going back to the main menu there's
nothing and it somehow decides to give the game more CPU priority or
something?

It's a wierd problem i've never seen before myself so am pretty confused... :P

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