Helpful guide to maybe help players fix FPS issues.
Guide to FPS/Stutter Fix
First and Only Step
So really all you need to do is go to the video settings, where you find display mode it should already be set to Fullscreen.
For some reason it’s like the game sets it to windowed but instead says fullscreen.
Set this to windowed and apply it, then go back into it and set it to Fullscreen again. This worked for me and I hope it makes your games run better.