Hey there, I had a similar problem to you, almost made me abandon the game. What fixed it for me was the Duxa installer and more specifically the CPU FIX executable. Before it, the game would never go into full screen, gamma would get often bugged out, lag spikes and most annoying of all, constant floor flickering and frequent crashes.
Absolutely give it a shot:
https://www.project1999.com/forums/s...ad.php?t=28335