Tried windows mode, didnt help. Running good old 1080p, same as in windows. RX480 8GB with a 4.2Ghz quadcore and 16GB ram. FPS will fluctuate between 20 and ~160 FPS depending how much terrain is on screen. (this is with the low quality preset)
I'm sure it'll get resolved soon enough, and turn out to be some tiny thing that has no logical reasoning behind it.
Edit:
Also, people saying they have no issues and people saying they *do* have fps issues is subjective. Some people are happy with 40 FPS after all...
@Doctor3D, what are some of the FPS numbers you're getting?