Change this. FRL and Engine.ini are not needed from what i know, its just to increase the fps cap, even tho i highly recommend adding a cap since i got issues with uncapped, such as very weird movement since the game isnt optimizated for that
GameUserSettings.ini:
bUseVSync=False
FrameRateLimit=Any fps cap if you want to, i recommend 120 since example 144fps might destroy your survivor movement.
Engine.ini
[/script/engine.engine]
bSmoothFrameRate=false
MinSmoothedFrameRate= Make this to the same number that you changed to FrameRateLimit
MaxSmoothedFrameRate= Make this to the same number that you changed to FrameRateLimit
bUseVSync=false
Also, make both files "Read Only" from properties.