Real pain is reading from my NAS via ethernet. It's connected via gigabit network and when I try to play even 2,7k it can't buffer enough and stutter a lot. I must say that via TV (which is connected just with 100M) and my old S905X (again 100M) android box it's working fine, so it must be RPi4 or LE issue.
I've never had much luck with the Kodi userland NFS client in LE, and NFS mount storage with an autostart.sh:
Yeah, it's pretty grotty, but it does the job. The sleep is long enough for the network to come up. This works on the Pi4 and the Khadas Vim. Couple that with a .kodi/userdata/advancedsettings.xml:
and it all works.