Have you looked in power managment? And selected high performance? I had mine high… but checked it after much frustration and it appears that MSFT update changed it to power savings. (a-holes). It’s been updated and there is a silly green leaf now that fills as you f’up your machine. I set miner to ultimate performance and noticed a high increase as it stopped throttling my 4090. I get around 89-112 fps in Fs2020 now. I don’t trust the FPS “dev” read out. It said I was getting 75 with my 3080ti and said like you around 25-35 with 4090. I could EASILY see it was smoother than the 75 with the 3080. So I don’t trust that read out. Also if you use frame gen was I do now with DX12 it will give FPS without the gen frame. Use another external app to see FPS with frame gen. MY 12700 never goes above 10% load. ??? I’d upgrade to 14900 but if the 12700 isn’t being utilized will a faster CPU help? I turned off the dev/fps since it’s NOT CORRECT. What says 25-35 is CLEARLY smoother than 75 from the 3080ti. No comparison. So I turned it off. STILL other than when loading… a flight my GPU is never over 40-50% on ultra. During city flights… during loading flight… and menu’s It can touch 99% briefly.
SOMETHING is not right, but it’s ultra smooth visually like the MSFT trailers I see online.