A screenshot with the most relevant virt-manager settings is added.

I tried again all my nested virtual machines settings. An overview of my 
configurations:
NOK: Ubuntu 21.10+Virtualbox 6.1.30 -> Ubuntu 22.04 Mate with Virt-Manager+KVM 
-> Ubuntu 14.04
OK : Ubuntu 21.10+Virtualbox 6.1.30 -> Ubuntu 22.04 Budgie with Gnome Boxes -> 
Ubuntu 14.04
OK : Ubuntu 21.10+Virtualbox 6.1.30 -> Ubuntu 21.10 with Virt-Manager+KVM -> 
Ubuntu 14.04

All Ubuntu 14.04 are the same VM qcow2 image. Both settings of the virt-
manager are exactly the same with respect to the displays.

Note that the differences in response times between OK and NOK are
higher than a factor 10.

** Attachment added: "Screenshot from 2021-12-08 11-43-43.png"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1953628/+attachment/5546319/+files/Screenshot%20from%202021-12-08%2011-43-43.png

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https://bugs.launchpad.net/bugs/1953628

Title:
  Too high CPU load in qemu-system-x86 compared to Ubuntu 21.04/21.10

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