I have the same issue and working with windows 10. To me as a software developer in the past, it’s looks like an initialization issue in the core of msfs2020.
Only when I start at the main page with the globe and go into VR then all is OK, no stutters, but once I go temporarily to 2D and back to VR it stutters like hell.
This is unrecoverable for me. I have to close the WMR portal to get it right in 2D. After that it does not help to restart the WMR portal.
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