I just upgraded to a 12900k and 3090ti and I can confirm main thread seems to be a huge issue in VR. Getting 80-85 fps with settings maxed out accross the board in 4k on my main display, but jump into VR and it’s 35 fps. Thats only 10 FPS better than my 1080ti while the jump on the flat screen is from 35 fps to 80. I’m trying to figure out why this is because the geometry change shouldn’t be the issue as my screen is a widescreen with about 120* FOV and I don’t know why it’s the CPU bottlenecking. I hope a proper implementation of DX12 will fix this by spreading the load for the CPU a bit better.
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