I don't remember what all of the limits / workarounds consisted of at this point. So you'll have to do the same as I would do: search this site for "maxfid" and read through the discussion threads that contain that string.

http://empegbbs.com/ubbthreads.php/topics/287390/Plain_english_description_of_w
http://empegbbs.com/ubbthreads.php/posts/250953

Enabling swap space would probably help, though. Dunno if it is already enabled when sync'ing or not.

Cheers