stutter with mkv streamed from nas

mkv files (around4-5gb each in size) streamed to the apple tv from my nas stutter quite a lot, not unwatchably so but enough to cause annoyance. I have 50mb broadband so thats no issue, with nothing else using the bandwith during playback, would xbmc remedy this as iv heard its a smoother player? any solutions would be appreciated really

Seems to be related to my issue on the Media Player 0.7 topic. Lets see what that brings up.