Lots of Uncached Templates on Special Pages
Particularly on Special pages under vBulletin, most of the templates used to create the output for the special page are uncached, and thus extra queries are added for each one. Special:Recentchanges has at least 6 uncached templates.
Since the Special environment is not loaded until after vBulletin has already cached templates, a post-loader for templates should be implemented, where the existing template cache can be updated later with a bulk update of new templates to cache. In this way, most uncached template queries would be mitigated.