I was having the same issue, and found out that when I did the update (thru Steam) it messed up some settings and even added a new profile for my keyboard!. Weird stuff, started happening to many others. First, I lost between 7-8 FPS and then my settings were changed to all assists, when I originally had it on all hard, no assist at all except for Co-pilot assisted ATC). Others also had the world not turning which was later discovered it was cause, apparently, by a corrupted profile (mouse, I think.). In 2D I am getting 60+ FPS with everything Ultra. I have a Strix 3090 OC. I tried everything, finally I decided to do a complete uninstall and re-install. Steam saves your settings and profiles, and when I re-install MSFS all of my ORIGINAL settings were there and my VR is back to normal on my G2.
Keep in mind that the new weather system puts a heavy load on our cards. I lower a few settings to high and left some of them at Ultra. I do not use openxr tool at all, I do not find the need. My RS is set at 100 and when it gets real cloudy over a large city I get between 25 and 28 FPS, which it is fine with me, I do not do barn storming or racing. From 2000-3000+ everything is pretty smooth and looks awesome.
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