We had a qlikview E2620 server (2.1Ghz , 8 cores, 126 GB RAM) virtualized on proxmox. We decided to change the processor to bring more power. We switched to an AMD EPYC 7302P (3Ghz, 16 cores, 256GB RAM).
We had during the transfer of the vm, quite a few problems with a windows process "system". It was consuming all the cpu resources at startup. It was doing a check on the ram, and all the processor was used. (99%).
My colleagues managed to solve this problem by dedicating 10% of the total ram to the hypervisor. Windows now starts normally.
I have some reloads that now take longer than before.