>/Users/users from homeserver.internal.local:/users/users
> Flags:
> rw,relatime,vers=3,rsize=8192,wsize=8192,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.0.6.9,mountvers=3,mountport=35079,mountproto=udp,fsc,local_lock=none,addr=10.0.6.9

How did you wind up with rsize/wsize of 8K? The default on Linux has been 1 megabyte for a long time.

Fix this, and I suspect you will find performance increases dramatically.

 - Pat