I found a fix. It’s a Windows 11 issue that causes the stuttering in my case. I have an Oculus (Meta) Quest 2. Other uses say it didnt happen with their setup in Windows 10.
Open the Oculus folder in program files.
Open the support folder
Click on the debug file.
This will open a dialog window.
Click on the service tab then start the service
You should get a debug screen pop up that constantly scrolls. Keep this open on the desktop when playing in VR.
To stop, click on the service tab and stop the service.
This has reduced the stuttering greatly in MSFS and completely in DCS.
I use default VR settings in both simulators but may need to tweek them for MSFS.
I hope this helps some of you.