Just as an addendum: I tried the "fix" (modifying the Min/MaxSmoothedFramerate) and it certainly improved things. The game is still stuttering sometimes but not nearly as bad as before. On the downside the 30fps limiter when using 20/30 as values is not very eye-friendly.
I'm now using
this still reduces the stuttering greatly but a 45 fps limit is more reasonable than using 30 fps.
Well, I tried that fix before but it only helped me a tiny bit..
Also the stuttering is horrible, it doesnt matter if I run at lowest or highest gfx settings, the stuttering is still there..