I have a cheap embedded linux NAS (a Seagate Central.) The device is certainly underpowered, but it's not entirely useless.
One thing that bugs me is that I can reliably copy a 300MB AVI file to my MacBook Air in 30 seconds (over WiFi) but if I try to watch that same file from the network share, after a few minutes of playback it locks the video player and the entire Finder.
This happens with both MPlayer OSX Extended and VLC; with various files; over both AFP and SMB. The video file that takes 30 seconds to copy is 30 minutes in playback time, so the network should be approximately 60 times faster than strictly needed. I've tried fiddling with the video players cache settings to no avail.
How would you debug this situation?