Hi,
Even though it is not available in VR settings I found it in the UserCfg.opt file in the VR section. Setting the “Quality” parameter to 3 significantly helped in VR, so the issue with the gradual load of trees as I move my head is gone.
Yep I can also confirm updating the UserCfg.opt file worked really well for me too. I set the value to 2 (High) and I definitely see improvement in texture load-in when turning my head.