Weird problem: Anyone else on PC have Elden Ring run just fine, but then other things run slow after closing it?

I don't know what could possibly be causing it, but when I decided to play some Risk of Rain 2, it just... wouldn't run smoothly. The framerate was cut in half and inputs were delayed. Restarted my PC, everything ran fine. Few days later, played quite a bit of Elden Ring, put it down, and... same thing. And it's not just risk of rain, TF2, VRChat, bloons TD6, even something as simple as VA-11 Hall-A, which is a bartending *visual novel*, all run kinda weird and choppy many hours after I play and close Elden Ring, but if I go ahead and boot Elden Ring back up, it runs perfectly fine. I have no idea what could possibly be causing this.