Severe VR frame drops w/ 4080 and 7800x3d

Hi,

yesterday I picked up War Thunder again, but unfortunately found that it is unplayable, due to frame drops.
When turning my head in VR, I get frame drops, where for 2–3 frames the image doesn’t change.
image
This even happens in the hangar and makes the game unplayable.
I can play all other VR games without any problems.

I am also using a decent PC that is not even utilized 50%:
Ryzen 7 7800x3d
RTX 4080 super
32GB DDR5 RAM
nvme m.2 SSD