Specs: Win7 pro 64bit , i5-6500 CPU, GTX 960 Graphics, 16gb Ram - Fresh installation , all drivers up to date. GOG Version issue: I launch game and screen flickers like 5-10 times and the game will sometimes load , but often it will just be a black screen and I'll have to power off PC . I've tried multiple compatibility modes , Desktop is 1920x1080 , I set resolution ingame to 1920x1080.? Steam Version issue: Game launches fine , game runs perfect 120+ FPS steadily . issue is my game will suddenly jump from 120FPS to 15fps instantly after like 10-15 minutes of playing . when this happens I save, quit , launch game and load my save, and it runs fine again for about the same time 10-15 minutes then jumps to 15fps again..? if anyone knows actual fixes let me know thanks