MSFS 2020 on a high end rig reality

[NeoKingRthur]

your FPS is shown as “Limited by Mainthread” it has nothing to do with your GPU.
Try this one from this post. See if it helps:

[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…