Ok…maybe someone can weigh in here.
I just reset my NVIDIA control panel 3D settings for MSFS2020 to default, and now the problem went away. I only had Tripple Buffering turned on, and Power set to High Performance. Now, I’m getting 45-55 FPS again with the ATC panel undocked.
My new theory is that if you make any changes to the VSync option in NVIDIA, it causes issues with MSFS. I had previously tried turning Vsync off in MSFS, and on in NVIDIA, and then reversed the change after performance didnt improve. Perhaps, ever since then, it was acting like it was still turned on in NVIDIA control panel?
After hitting the “restore” button in NVIDIA, i’m back to expected FPS.
Odd?