Ok so identical situation for me here. They NEED to fix this ASAP as all my friends in the sim are hitting this too. Thus not isolated.
I have perfect 50-60 FPS and goes to 20FPS and max stuttering. For me the GPU goes to idle almost and my Core #20 is the one pegging and mirroring the GPU workload almost to the dot but in reverse (pegging while GPU is idle). These are my observations and specs:
-I had consistent 35-45 FPS in VR , even after England update. Never seen such periods of stuttering before
-I have i9 10900, RTX 3080, 32GB
-Nvidia driver 457.3 and yeah it also suffers this issue, so this is not Nvidia related
-It happens with any plane but not always. I observed areas like Alaska where it never happens and flies smooth. Then randomly will trigger this and ALWAYS in the same areas. There is this patch of grass in a local hill I fly, where I always see the degradation instantly there, going from 60 to 20 fps instantly and Core #20 pegging. It is not a heavy area at all, so it is not related to that only.
-This interruptions will last forever while I fly such identified spots. They don’t resolve after 55 seconds as others have claimed. If I fly away from that area it resolves quickly…but then I will hit another similar issue area…etc…
I did not try any lasso procedures yet… this is what I see since last update consistently.