First off, thanks for any and all help, it is much appreciated. In my hours (yes, hours) of searching, I have found 3 relevant solutions. 1- Edit "player.json" file for the line titled, "flush previous frames" 2- Same "player" file for line, "sim processor thresh" and 3- Edit "controller" file for line, "set update limit" The problem is, none of these lines exist in my player or controller files. I have the latest build (1098 i believe), so maybe they've removed these parameters... I have found that I am only affected when I use the 2015 F1 cars on certain tracks. For instance, 2015 car at Melbourne, can't hardly exit the pits. And it's not just me, if I sit in the garage and watch the monitor, AI performs just like me. With ISI F1 2012 car, no problems. 2015 car at Montreal, no problems, only certain tracks, but so far kinda a lot of tracks (Hockenhiem, China, Malaysia, Melbourne, and Silverstone so far). I've read about a bunch of people having trouble at Mills Park, specifically with the Megane's, but I have no trouble there with any car there (haven't tested 2015 F1 cars there though, only a bunch of GT and Road cars). There are currently 3 different releases of the 2015 F1 cars, though I believe they all stem from HJK's F1 mod. I have tried all three and none are any different. Also, it doesn't matter if I'm alone or with a full grid, no difference with any control group (i.e. tracks/cars that work or don't) With "ctrl+c" displaying cpu load, it shows that the cpu is maxed out, but I KNOW my pc can handle it, any other car (or track where the 2015 cars work, like Montreal) the cpu load barely goes above 50%. And again, that's with a full grid (22 cars) on track at racing speed. Rivatuner shows my Gpu tops at 60 degrees celsius, and my Cpu tops at 65 though usually sticks around 55, even during the stuttering. To my knowledge these are both WELL within operating range. Settings are maxed (no v-sync), but I play P-cars, Dirt Rally, and Forza Apex at maximum settings and I run 40+fps with no problems. When it's performing correctly, it runs an average of 90 fps, bottoming at 60, and occasionally reaching 120+. What's funny, is that usually during stuttering, Rivatuner says I'm at 100-120fps. AMD FX-8320 8 Cores @ 3.2 Ghz MSI GTX 960 Gaming 4Gb Edition Team Vulcan 8Gb Ram (2 x 4gb) Cooler Master Hyper520 dual cpu fan Once again thanks for any input. And sorry for the long post, I'm painfully detailed.