XBMC-Choppy Video

I just installed the ATV Flash-everything seemed to work great. I got the new Version of XBMC and linked it via smb to a share. When I play a video there are times when it gets very choppy. I also have a old xbox that runs XBMC and it can play the same video no problems…I saw another post where it said change your video sync to always…but that was the default setting.

Any help would be great…

Thanks

What type of file is it you are playing?

It is just a avi file…my macbook or a old xbox with xbmc on it playes it no problem.