Hello Guys,
I have the same problem, I am using kernel 4.19.0-17 on Proxmox 6.4.1, because I have performance problems for backups / restore file transfers when using kernel 5.x. A few days ago I posted here:
https://forum.proxmox.com/threads/slow-restore-between-proxmox-7-0-and-nas-nfs.96588/...