Heavy Stuttering after a short time of butter-smooth performance: help me troubleshoot the issue

I tried a bunch of new things -

  • Most GPU-related settings on ULTRA, CPU on lower (LOD 100 etc.),
  • Disabling real time traffic (AI Traffic only),
  • Restoring Memory, CPU and GPU to stock settings (removing any overclocking)
  • Reinstalling .NET pieces missing after some Windows update
  • Deleting some Photogrammetry Cities (from World Updates in Content Manager)
  • Forcing ResizedBar via Nvidia Provile Inspector
  • Deleted content.xml (so it’s recreated at start)
  • Deleted Scenery Cash from RAMdrive

Loaded 737 in JFK with Broken Clouds. First minute - good, then the stutterfest again… Arrrrrrrgh…

What’s interesting is after i close VR, UI and hangar and everything in 2D is also stuttering for a minute or so, then it gets smooth again