This is some of the best news I've read so far.
I had this problem myself, but it was during replays. In case it ever develops again there are a few more things you can try. Disabling V-sync...
If you run V-sync try disabling it. That made a significant improvement for me (GeForce 9600GT 1Gb). Also set your Maximum Pre-Rendered Frames to...
Scott, are the AI given any data about the relative position of a player's car, or other AI, in its current implementation? When a car is on the...
Try disabling AMD Cool'n'Quiet in your BIOS. I've never had a problem with this before, but I noticed a significant drop in processor load with...
Try disabling Intel SpeedStep in your system BIOS. It's usually not an issue with newer software, but you never know with this being an early beta...
I think you and I are experiencing similar problems, but it was happening at various parts of the track for me, not just the start. The game...
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