I discovered this problem this January. In a nutshell it makes it impossible to post competitive times. I can still post very good laptimes, but my best laptime will max out at some arbitrary limit that falls short of the fastest lap that is possible. Also there is something going on with the physics that makes it near impossible to take steps forward developing a setup. It's like bizarro world when I develop a setup and nothing seems to make sense. I originally had an i5 6600k, ASRock Z170 Pro4, 16GB DDR4, GTX2070 and upgraded to an i7 7700k because I thought that this upgrade would solve the issue. I'm not sure it did. It makes the issue less extreme and I've noticed and increase in rear grip and setups that I developed while on the 6600k don't work at all on the 7700k. I forget where I read this, but somewhere I read that if you have this issue then your top speed will be reported as a different speed on Liveracers than the speed the game shows you on track on your speedo. Also I read in a thread to force 32bit to solve this issue which, even if it does, I can't do Nordschleife in 32bit. So before I buy an entirely new Ryzen PC, I'd really like to do some fact checking and see if you guys at S397 have tests I could run to figure out what is going on. Maybe this is an issue with the way rFactor 2 is installed. But one of the first things I did on the 6600k was reinstall and test the fresh install; it made no difference. The game runs AMAZINGLY smooth at 144 fps on my triple screens. From my perspective, you would never guess that there is a problem. Even on the 6600k I would have never guessed this was the case. Sometimes certain cars, GT3 is maybe the worst offender, will give me an extremely rough time and I'll spin for no apparent reason and I'm left with no explanation. My PC is amazing and I don't see any reason as to why I would have this problem when other people with significantly less powerful PCs have no issues. Could it be my motherboard? Whatever the case it seems like something I could never figure out on my own. I've tried all different combinations of CPU and GPU clock speeds, game mode on and off, disabled C-states and any such BIOS settings. I would really appreciate if somebody could maybe give me some troubleshooting steps to narrow down where the problem is coming from and maybe rule out buying an entirely new PC. I understand that this problem is subject to whataboutism and that this is an extremely rare problem in rFactor 2, but I'm fairly certain it is a real issue for me.