Noticing this problem now, where I didn't have it in previous months. When I launch the game it's fine for 5, max 10 minutes. Then it starts dropping fps and turning into a slideshow for 1-3 seconds everybd 5-10 seconds, consistently and on a very even interval! No idea what causes it other than a new issue with Nvidia drivers or an update to the game, or both.

I've tried all the obvious things, changing every vsync, gsync, windowed/fullscreen, etc. setting in every combination possible. Disabling all overlay applications, messing with windows settings for fullscreen apps, nothing helps here. I assume the only thing that will help is an eventual nvidia driver update in another month, if this gets reported properly. Might've been going on all year so far - I've not been logging in for longer than a few minutes since December at least, and wouldn't have noticed.