Hello!
I use a system with a processor that supports hyperthreading. There seems to be a problem. I can run the game at any resolution at 70 to 90 frames. With hyperthreading switched on (in BIOS) I get a lag problem after some time. This means I can drive 2 to 4 laps, no problem. But them the frame rate will drop and the car is undriveable.
It took me a long time to find the problem. I updated drivers, used different wheels, re-installed the whole system. Finally I recorded the processors activity and found out that the longer I drive the less it is busy. This hinted me to the problem. Well, luckily there is a switch in my system's bios that let's me switch off hyperthreading.

Maybe some other people have had problems with this, but I could not find any reference in this forum.

Do you consider this as a bug? And shouldn't hyperthreading make the whole thing faster?