Slow KVM after moving from 20.04 to 21.04

I use a lot of KVM through virt-manager.

On 20.04 it worked ok, but on 21.04 the VMs are kinda slow, specially the UI.

Is there some known problem around this?

I’m on a XPS 13 32gb RAM i7 11th gen

UPDATE:

I moved back to 20.04 which is much much faster. I don’t know what’s wrong but something is very wrong with 21.04. Unfortunately I needed 21.04 to use HDMI because 20.04 has a terrible bug on my xps


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Author Of this post: Rafaelo
Title Of post: Slow KVM after moving from 20.04 to 21.04
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