if you are experiencing a delay in ANY type of media playback, perhaps you should read the documentation...
the only thing that delays any playback is either 1. a network problem, or more likely 2. a cache setting that is too high for your liking...
I suggest you sit down and take another gander at your config.xml file, or peruse the sourceforge site for xbmp and look at current bugs (and ones that have been closed because they are either fixed or bogus).