As far as I know during kernel compilation there's a parameter to set maximum number of cores, I tried a couple of times (not so much tbh) and I was not able even to boot so I left that aside.
Would be great to increase it to, for example, 16 since it is a number more easily achieved nowadays, I still have there a threadripper 1950x collecting dust... That would be great to use for VMs in xpenology.
I know that there are better solutions as unraid or esxi... But I don't have so much time to spend configuring... I feel so happy with that easy approach (since now I am far from home and I can not put my hands on new projects).
Please note I enjoy so much xpenology and I would like to thank you all collaborators, is still my 24/7 server.