I've spent a couple hours looking at all the threads complaining of CPU load after an upgrade but haven't found a solution. Here are my servers stats after the upgrade:
proxmox-ve: 6.4-1 (running kernel: 5.4.140-1-pve)
pve-manager: 6.4-13 (running version: 6.4-13/9f411e79)
pve-kernel-5.4: 6.4-6...