One last important question to the community

I have 64-bit windows 7, my GP4 lags somewhat when close to other cars when racing. I there a way I can speed up my game and the graphics? Sorry about the double post.

i have heard of a problem like this before and if im is correct it could be your 3d settings on graphics card,does it also go slow in hi detailed places like the pit aerea and straight,you could try dropping your 3d detail down abit which should be in your graphics card control panel,there should be a 3d option there,when you click it there should be options there that should help

Yoou can also paly with ingame audio settings or try to reduce or disable your audio hardware acceleration (somewhere in the windows audio settings but I never remind where).
It's quite known that GP4 doesn't like all sound cards.