THANK YOU! So glad you took the time to write that. With one command line my system is flying.
I assume the thread you reference is this one:
…where people have been working on this for years (and I benefit from it in an instant!).
That was definitely it as (per the thread) xenpm get-cpufreq-para was failing on all cores but worked after loading xen-acpi-processor. Vm launch issues are gone.
For anyone unaccustomed to loading kernel modules (like me), these are the commands:
sudo modprobe xen-acpi-processor
Then persist across reboots with
sudo nano /etc/modules-load.d/xen-acpi-processor.conf
And type
xen-acpi-processor
^X to exit and save changes.
This is common hardware (esp for Qubes) and worked fine on 4.0 so I’m not sure why it failed on 4.1. Maybe because I transplanted the 4.0 ssd from a different model machine into this model, it had been installed on a different model.