Is the high CPU usage showing up inside the Windows Guest (Task Manager), or on the Proxmox Host GUI?
If inside the Windows VM What specific process is consuming the CPU?
I would suggest to test to:
- Increase the assigned core to e.g 8 cores...
hmmm there currently known issue explained in:
https://forum.proxmox.com/threads/windows-server-2025-cpu-suddenly-at-100.184763/post-861490
Where its recommended to use CPU type other than host CPU. So you can roll out this and keep CPU type as...