FPS extremely low after a long time running, but when in the menu, FPS will go to it's normal state again

[NeoKingRthur]

Judging from the first screenshot, it looks like you’re limited by mainthread. Have you tried applying this? This topic helped me get out of the Limited by Main Thread issue and restores my FPS.

[Solved - Disable hardware virtualization] Limited by MainThread but not a single core is close to 100%

Good news! I was comparing my setup against a friend’s one with a very similar system (but he was getting much better CPU frametimes) and the only thing different was he had virtualization turned off. Guess what? I disabled SVM in BIOS and I’m now getting much better core utilization. That main core is now on 90% instead of 70, 75%. My CPU frametime dropped from 24ms to 17ms (paired with my GPU’s) and the FPS increased from 38 to 52 around the same spot. Here’s a new screenshot, more or less…