There’s another thread that I found where many people were having similar issues, I myself being one. - [Main Thread] Frame Rate Hitching / Stuttering on PC 4090
I’m using a 3070ti and every now and then my frames would drop from 144fps to 4fps.
It turns out it has something to do with the game “polling audio devices”. It appears that some network situation causes the game to continuously perform this action causing massive stutters.
The fix for me was setting my network on my pc to public and stopping the “SSDP Discovery” service in task manager. Since then it’s been running smooth without a single drop for a solid hour or two.
Hope this helps!