I get less FPS with MT in VR and more FPS with MT Non-VR

[Hoggorm]

Hello,

 

I have a fairly high en computer:

AMD AM4 Ryzen 7 5800X3D CPU

MSI GeForce RTX 3090 Ti GAMING X TRIO

HP Reverb G2 VR

 

I use the Marianas F-16 Free Flight Instant Mission to test FPS and I get the following:

 

In VR without MT: 40 FPS

In VR with MT: 35 FPS (CPU Bound Main Thread and CPU Bound Rendering Thread)

Non-VR without MT: 60 FPS

Non-VR with MT: 90 FPS (GPU Bound)

 

The Non-VR part is basically a test only since I only fly in VR. I see that I get about 5-15 FPS less using MT than what I do without MT. Using the FPS counter I see that I am CPU Bound Main Thread and CPU Bound Rendering Thread in MT (sometimes flickering back and forth very fast between red and yellow).

 

Going through the checklist in the FAQ for "Why am I seeing no to little performance gain?" all steps have been done. I've set Nvidia Thread optimization to On (instead of Auto)

SMT in BIOS is set to Auto.

Using Windows Performance Monitor it does not seem like my CPU is used to the max even though I have the CPU Bound message in DCS while in VR. See attached screenshot.

 

I really do not know where to start to resolve this issue, so any suggestion is appreciated.