Rimworld Laggy on Fullscreen

[kwangiskhan]

I recently noticed that putting Rimworld on Non-Fullscreen makes the game so much smoother. Like night and day difference. I currently have a GTX 960M on my laptop but was wondering if anyone had a fix for this. I'd like to keep my game in Fullscreen because it's just more immersive. Also on non-fullscreen if the window isn't 100% maxed out it also lags.