So there's this glitch with iTunes Match that somehow creates thousands of empty playlists. I posted earlier about this and snippeted a simple script to scratch the empties from your iTunes. Too simple since it appears to get really bogged down trying to examine playlists while iTunes is deleting them. Correspondent Lowell Stewart suggested deleting in batches to give the processing some breathing room, and I've incorporated this in an update to Delete Empty Playlists. It's definetly speedier using Lowell's suggestion.