Are you experiencing occasional or frequent stuttering/freezing in this game with your steering wheel?
I've read it occurs when using FF steering wheels, or possibly FF devices in general. I think a lot of the posts on the TDU forum with similar symptoms are because they are running it on a computer that is way too slow anyway. But it seems like FF steering wheels caused that regardless of your computer. If it runs at 40-60+ fps most of the time but has odd points where it almost entirely freezes (0-5 fps maybe) that seem to have nothing to do with the amount of onscreen action, that seems to be a confirmed FF wheel problem with this game. I'm just wondering if you are getting it too. The recent patch that FINALLY came out after being delayed for months made no mention in the changelog about the problem.
I had that problem in TOCA3. It ran perfectly fine most of the time, but fairly often it would freeze more or less for a couple of seconds then resume. It only happened when I used my FF steering wheel (Act-labs Force RS), not with my 360 pad. I'm not sure if the latest patches have fixed that or not, but earlier ones didn't. The solution was to set or use a shortcut to run TOCA3.exe in High priority mode, and all stuttering/freezing went away with FF wheels. I'm told that didn't work for TDU, and the solution on the forums for TDU is to completely DISABLE force feedback through the registry. Nice fix...