Overwatch has FPS drops and low workload

I have the Problem that Overwatch runs sometimes awesome (180-200 FPS) and on some moments terrible like 30 FPS.

It has at the start a CPU workload of 90ish and a GPU Workload of 10ish, after some time it gets normal, like it was described on the page. Than after some time i have massive Drops and the workload is practically nothing GPU CPU workload 30ish.

What could it be?

I didn’t run the “Execute Script” like told on the page, because i don’t know how to do it and if this fixes the problem entirely.

I’m new to Linux and Lutris, if you need more information i can provide more of it.