What do you get if you just time the directory listing locally from the TrueNAS system itself, both with and without SMB in the way?
Eg: time ls -la and time smbclient //server/share -U username -c "ls" ?
What do you get if you just time the directory listing locally from the TrueNAS system itself, both with and without SMB in the way?
Eg: time ls -la and time smbclient //server/share -U username -c "ls" ?