I had problem with slow FPS / Crashing when I re-started playing this game about 2 mos ago and I did the following:
1) New Nvidia Driver 81.84
2) New Sound Driver Latest Soundblaster
3) Re-Flash the Mother Board
4) Defrag
5) Adjust Nvidia Settings
6) Remove un-needed background processes
7) New Direct X (9C I beleive)
8) Disable Norton / Microsoft Spy Remove
It was a little better and still crashed on occasion. I removed a the Audio HQ toolbar and that did the trick for the crashes. As for the FPS I was still @ 8-12 FPS @ the beggining of an online race and never better than about 28 FPS when racing online..
I was thinking about buying a new video card when I saw this post. I went to NVidia and got the 81.87 driver and went from always getting passed on the first corner with my choppy hard to control 8-9 FPS to a "So long sucker" smooth & controllable 22-25 FPS. For the rest of the race when the traffic clears up a bit it now runs between 52 and 60 FPS!.
In conjunction with the the 4XS Antialiasing setting on the card I've got eye candy I never knew I had
. It's like a different game! Within 30 minutes of playing online I was a good .5 sec faster around Blackwood (FOX) than I ever was before
My PC has : Pentium IV 2.20 GHZ 512MB Ram, NVidia GEForce Ti 4600 128 MB, slow 60Hz LCD Flatscreen, Sound Blaster Audigy 1st Generation