I've spent at least an hour trying to get the demo to run right. I can put it on medium settings and get ~20fps in benchmark. I think the handling problems I'm having with the cars are related to the fact that the game simply isn't running properly, and that the Porsche is just the most affected. This isn't an isolated problem. There are a number of reports, both on the FM forums and elsewhere, of people with i5s/i7s and 1070s/1080s having stuttering, frame rate and performance problems. This may be related to the fact that the game maxes Core 0. FH3 used to do this, and it caused a lot of problems for people (especially with higher end hardware) because there's only so much a single core can do. Eventually they patched it, but until then the best fix was to manually disallow affinity for Core 0. Unfortunately, that doesn't seem to work here. And more unfortunately, it's by design and T10 recommends setting the game to VSync 30 (which doesn't really help either, actually). So there's not even really much hope that they'll apply the FH3 fix to this in the near future. Props to all of you for who it's running great and are having fun, but I can't justify spending money on a game that won't work. Especially one that seems to be not working for the same problems that they ran into with FH3. I worked through them with that game, and I'm glad that I did, but I'm not eager to go through that again. At this rate, I may end up buying none of the big three racers releasing this year.