I’m in a similar position with the 5900X/3090 with the sim on an M.2 drive, settings similar to yours at 1440p. You’d think something like this would make light work of the sim given other’s reports of excellent performance. Nope, 20-30fps throughout flight, even in the middle of the ocean. Dev mode FPS counter shows 30+ ms for CPU frame time which I suspect is what’s bringing the FPS down. GPU frame time is fine and lowering GPU related settings doesn’t make a difference. TLOD seems to be the single largest influence on the CPU. I feel like I’ve tried every combo of DOCP on/off, HAGS on/off, DX11/DX12, TAA/DLSS, driver updates, empty community folder, and full sim reinstall but nothing seems to help. CPU/GPU temps are where I’d expect. I can easily get good performance and low(er) frame times in the default planes (sans A310) anywhere, but the moment I go to a 3rd party airliner things tank. I did see slight gains doing the auto overclock with AMD’s Ryzen Master software.