is that relativley slow compared to ethernet?

yeah, well kinda.

Using emplode over ethernet I find that I get 25 Megabytes pers minute or so.
With jEmplode, I get 30 Megabytes pers minute or a bit more.

FTP is another story where I get 45-50 Megabytes per minute. but that's just FTP.
You can't FTP your songs and playlists..........
........yet.