ZVM on a I5-7600T

I've tested several OS versions because 
I'd really like to use this feature!

Unfortunately, neither of the directly offered Distributions
Mint nor Ubuntu are usable because they're so slow.

Even a ZorinOS 18 Core version installed via ISO was unusable!

It's an i5-7600T quad-core system with 16GB of RAM and an M.2 SSD.

I assigned the VM 2 CPUs, a 32GB hard drive, and 4GB of RAM.

Is there anything I should be aware of?

BR