Windows 11 Virtual Machine very slow performance

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[SOLVED] Post in thread 'Windows Guest Boot Hangs after Enabling Hyper-V in Windows Guest on 13th Gen Intel CPU'

I was searching for days in order to get my WIndows 10 Pro Desktop VM back online again (while keeping the host cpu) after enabling Core Isolation (aka Virtualization-based Security) without doing a snapshot in advance. And then I luckily found this link. It turned out that getting the nested Hyper-V and WSL running on my Intel i7-13700T Proxmox VE 8.1 host was just a matter of adding
Code: 
args: -cpu host,level=30
in the VM config file.

Afterwards the VM instantly booted again but still felt a bit slow and caused its assigned vcpus to constantly run at high load. After carefully...
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I may have come across what you're probably after in my own feverish research, and couldn't help but make an account to link it ^^ @AllanM
 
Just to add my experience with this issue for those who have tried everything and still have sluggish Windows 11 VM performance. The "magic" setting for me was the vIOMMU option in Machine settings. Setting it to Intel in my case made a world of difference!

Running PVE 8.2.7 with a Win 11 VM. The host is a Minisforum MS-01 (cluster) and I'm using the DKMS Kernel so I can pass-through the Intel iGPU. Things worked, but even basic operations in Windows took forever. The exact same config running Win 10 ran great, but 11 ran terrible. Trying all the recommendations in this forum and elsewhere either had no noticeable impact or would break the pass-through. I suspected it was related to the nested virtualization issue, but couldn't find a fix. Then I read that vIOMMU is supposed to allow passing PCIe devices through to level-2 VM's (nested virtualization!). Viola! Perhaps it will only help in very specific use cases like mine, but hopefully others will benefit.
 
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