I have used 1.21 beta now for about three hours. In my system the performance is not any better than it used to be. It's the same. Framerate is not the problem, I get 35 - 55 which in my opinion is enough for this type of game. So far so good. But. The stuttering is still there, it looks bad and the resolution I use does not affect this phenomenon at all. I have tried full HD, 2k and 4k. Graphics options are high or midrange all, the upmost option ( cannot remember what it is called ) I did not use at all. With the word "stuttering" I mean irregular 0.1 seconds -> perhaps 0.2 seconds pausing of the game, probably most of you know what I mean.