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I resolved it by disabling memory integrity in windows security, is it enabled in your case? https://forum.proxmox.com/threads/windows-guest-slow-after-pve-6-to-7-upgrade.93302/#post-435442

Actually, I have a few days ago. The “Core isolation: memory integrity” feature in “Windows Security” was the cause of the performance dip. Once disabled the machine returned to work quickly and flawlessly. I can speculate that one of the VirtuIO drivers doesn’t play well with VBS and HVCI and...

Got another interesting screenshot, avarage VM cpu usage: (I upgraded on the 23rd of July)

This is "idleing" at 30% cpu (doing nothing) When I RDP to it, it spikes to 90% CPU in the VM - and the host load avarage spikes as well to 3.00. This is so weird because this setup worked flawlessly in the past. The VM is VERY unresponsive and slow.

root@REDACTED-pve:/home/REDACTED# qm config 106 agent: 1 bootdisk: scsi0 cores: 4 cpu: host,flags=+aes description: REDACTED ide0: local:iso/virtio-win-0.1.185.iso,media=cdrom,size=402812K memory: 8192 name: REDACTED net0: virtio=REDACTED,bridge=vmbr0,firewall=1 numa: 1 onboot: 1 ostype: win10...

Hi! I've been using PVE for about a year on my DL380G8, it has been running great with a few guests - one of them is a Windows Server 2019 (as a AD DS DC) It worked great so far, but after I upgraded my host to PVE 7 successfully (following the official guide) - the windows guest became...