Very poor perfomance in VR mode

Bug Reporting Hub Install, Performance & Graphics
3

You might want to review the following, it may help you (or not):

My 2070 SUPER VR settings and suggestions (Index - SteamVR)
My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR)

NB: among other things, have you tried 457.30?