If it's possible to over-subscribe vCPU's: What do vCPU's really represent - A weighted average of CPU cycles that will be allocated to the guest?

e.g., If a host has eight CPU cores with hyperthreading enabled and all four guests are allocated 16 vCPU's: What benefit will the four guests see over what they would experience if they had each been allocated 2 vCPU's?

TIA,
Eric Pretorious
Reno, Nevada

@olivierlambert Refreshing the status log and updating a second time retrieves/installs more updates.

After that: The '+ New' menu button appears in the menu on the left side of the window!

Thank you!

Eric P.
Reno, Nevada