I run single race @ 55 FPS (this value i limited in player file). I tried to add some AI and run @ night in malasia then my FPS lowered to 35 FPS-45 FPS no stutering. Then i go back and tried to run with only 10 AI (as i was running before) and coundnĀ“t get up to the 55 FPS again. I had to quit the sim and launch it again and my 55 FPS where there again. I run SoftTh 1.07 (tried version 2.xx with no sucess, 1.09 give me lower FPS) E8400 @3.6 GTX 460 2GB 4GB DDR2 Windows 7 - 64