Stutters above Caucasus forrests in Pimax Super UW

[Katmandu]

My system is 9800x3d, 64gb, 5090, win11. I get stable 90fps when low flying above *normal* land with a few trees, villages, etc. Once I low fly over some forests, my frametime turns into a saw and i get constant stutters. No issues on 4k flat screen of course.

Flat screen over forests:

VR over forests (bad graphics appearance due to quad views):

VR over normal land with some trees and buildings (solid 90fps, the solitary spike is due to screenshot):

What can be done is the question! Could it be Pimax headtracking sapping the CPU? I attach the mission file, forrests are straight ahead, "normal" landscape below.

F15C vs MiG-31.miz

[MadMonty]

Try limiting FPS in DCS to 120, other values caused micro stutters in my case. If it doesn‘t help, try other values. DCS FPS does have an impact on micro stutters…