I have a very strange performance issue with LeMans...
Using the TV cameras, I get some MASSIVE stuttering almost all around the track, which doesn't happen for example on ISI's Silverstone or Virtua_LM's Sebring. I have basically all settings maxed out except for soft particles which are set to low and wind and crowd animations are set to off.
Going around the track, the framerate stays locked at 120fps, but then suddenly it dips dramatically to something like 60fps, but the game looks like it's running at 10-20fps.
Noticeable sections are (especially visible and heavy when using the TV cameras) when the car goes through the first corner and the little chicane, the corner which leads into the first section of the Hunaudières Straight and the 90° right hand corner at the end of the Hunaudières Straight (the Mulsanne corner). I switched back to another driver revision for my GTX770 because I thought the new driver was causing issues, but that wasn't the case. Could it be a build 660 issue, or is it an issue with the track? It happens when driving myself, letting the AI drive and even when watching a replay.
I monitored my CPU load (Core i7 920 @ 3,6GHz and deactivated Hyperthreading) when I watched the replay again, just one car on track, and when the car went through the Mulsanne corner my CPU usage went up to 98% on the first core, the rest a little bit lower, but all close to 90%. The result is the super heavy stuttering which looks like 10fps on screen, while the GPU framerate still reads something between 60 and 70. The funny thing is, when the car goes through the corner, the framerate dips instantly, but pausing the Replay at that moment will make the framerate crawl up to 120 again, but slowly and progressively.
What could be the cause for this? Is this "normal" for LeMans? Driver issues/build issues?
All I know is my system runs fine anywhere else and stays around 60°C for both CPU and GPU.