XPS 15 9500 GPU getting shredded

Hello, I’m having an issue with the recent flight and was wondering if anyone could help. I’m using a Dell XPS 15 9500 and have no issues with MCC in fullscreen, but when doing borderless fullscreen in the current Infinite flight my game is super stuttery, tons of lag to my bluetooth mouse, and more. But when I go into windowed mode, no issue. But this does drastically reduce my graphic fidelity.

I was wondering if anyone knows solutions to this or if they’re having the same issue? Thanks!