VR with post processing & in car reflections on ultra causing issues in menus

I've been tinkering a bit with all the settings and found a way to run post processing & in car reflections at ultra smoothly while driving. However when in the menus I get constant frame drops and crashes with the settings at this level, so I've turned them back to the lowest setting. The game truly looks amazing with these turned to ultra though so a fix for the poor menu performance would be great.

Some additional feedback - I would love it if the whole game was rendered in VR - menu screens, replays after a stage, services, everything. This was how it was when I was playing it in UEVR and it was cool

RTX 4090

i9 13900k

HP Reverb G2 (set to run at 60hz)