TM significant quality drop when switching to VR

Hey i experienced a significant quality drop when switich to VR Mode in Twinmotion

before entering VR Mode the picture looks like this with all its lumen beauty etc:

i dont know what happens everything is set to ULTRA and DX 12 no dynamic quality etc.

The Headset is a and connected with a cable to my PC :

Meta Quest 3

Ryzen 5950x
128 GB RAM
RTX 3060 12 GB.

Do i need a 5090 for that? I mean its pretty laggy for such a rudimentary geometry / task

thanks in advance!