Borderless Windowed poor performance (stuttering/seemingly low fps)

[Puss_Kat]

Hello!
I've been racking my head around this issue for a long time now. I play in fullscreen mode but for ease of use (and possibly fixing my directx woes) I want to play in borderless windowed. However, when I use borderless windowed I get really stuttery performance.

What I mean by that is my fps reading says the game is running at 82 fps (my cap) but looking at it, it's clearly not. If I switch to fullscreen, buttery smooth, clearly running at 82fps.

I run two monitors. Main one is 1440p 165Hz with Gsync. The other 1080p 60hz no gsync. I've tried a lot of possible fixes but nothing has worked.
Can anyone help me?

The internal FPS limit does not function properly on Borderless Window with high refresh monitors and never has, it introduces a faulty vsync which will result in you getting the divised rate of the current potential framerate instead of divising the peak refresh rate, similar issues can be seen in Grim Dawn when using vsync+borderless.

ie, on a 144hz display, if you can only achieve 82fps the 1/2 limit will result in 41fps in Borderless window, instead of the 72 that Fullscreen achieves.

utilise RTSS to achieve your desired frame cap instead when using borderless.

Else, use Fullscreen, Windows 10+ optimizes fullscreen modes to behave closer to borderless windowed.