This plug-in is perfect, and very often updated. Congratulations to the plug-in creator. There is one optimization missing, though: this plug-in can't remove "empty tags", i.e. orphaned tags that are no longer associated with any posts. It would be nice if "remove empty tags" was added to the list of possible optimizations, so that I don't have to use another plug-in (called "Empty Tags Remover") separately. Anyway, just a suggestion.