Impressed by how easy it is to run a virtualized MacOS Ventura on Linux with quickemu! I tried some other MacOS virtual machines or Docker images, but none has worked so easily and immediate as with quickemu.
I notice that my libvirt VMs have been running slow. Out of curiosity I started one of the VMs with the standard quickemu conf file. The VM ran much faster.
Hmmm... I may use quickemu from now on. Thank you @wimpy for this super solution.