Very slow performance on Win11 guest with PVE 7.4


Active Member
Oct 2, 2019
So installed a Win11 guest with UEFI, TPM2, VirtIO drivers, and SPICE.

I think I have disk performance problems:
Overall, compared to a bare metal Win11 installation, the "experience" feels indeed usable but a bit "laggy"; for example in the Start Menu opening, contextual menus with right-click, moving windows, etc.
But most important thing, when there are cumulative updates for Windows, like this week, on bare metal it takes half an hour since downloading until finishing rebooting, and in the Proxmox guest it takes 5 times that, which is already an exaggeration.
The virtual disk is RAW format indeed.

The VirtIO ISO version I used is actually old, 221. But latest one is 229 from half a year ago and by manually inspecting the included drivers I noticed virtually no differences (it's evident RedHat is dropping VirtIO development for good); aside the fact that qxldod driver is still only "win10", despite somehow working on Win11.

Is anyone else having similar problems?


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