Hi,
i had a Bad experience when i changed to Windows 11.
When Using my Pimax all games were stuttering, even at low resolutions. Elite Dangerous nearly unplayable.
I found the very easy solution on Reddit!
Win11 has a feature for Gaming Improvement.
Just Switch it off!
You find it on System>Screen>Graphics>Change Graphics Standart Settings>Hardware Accellerated GPU =SWITCH IT TO OFF
After this, your VR Hedset runs Smoothly as before.
All the Best
Tomkin