How to Fix: FPS Boost
So, it literally does not matter what settings you change in the game. Even with Digital Foundry’s helpful video. What I think is going on, is some kind of bug where the game automatically continues to change screen modes.
By doing the typical Alt+Enter, does put the game in full screen and therefore has a huge jump in performance, but only temporarily before being “reset” somehow to a different mode and seeing frame rate dip back down into the 50’s on a 4090.
The Dynamic Scaling options must have an impact on this. If I jump back to say Windowed mode with Alt+Enter, frame rate jumps back up to 110+ again on 1440p.
I’m not sure how else to get the screen mode to stick, but just giving you all a possible work around that seems make a difference for me.
Surely I can find the INI file somewhere and see if I can edit it there and make it read only so that these piss poor in-game settings can stop reversing themselves in game.