dumass u play with the AI or online?
Ai makes fps drop cos it has to simulate the AI cars.
If u race online then u must have either shadows that cast over the cars or in the cocpit or reflections on because those effects might be a little bit too hard for a gf2mx to handle.
I play the sim on 1,8ghz, 512RAM, GF2MX/200 32mb and res is 800x600 with no reflections and only normal shadows, low world quality, mediom car quality, 100% view distance, some trackside objects and high mirror quality. pretty much everything else is on exept lightning effects and spectacular lighning.