Thread:Hatebunny/@comment-4852216-20120304202542/@comment-3361105-20120304203337

Cover galleries take a while to load because there are so many images. cid and cis make the pages take even longer because they have to retrieve info from the issue pages. So, when it's a short series, cid or cis are probably okay, but on something like Superman/Batman, or something even bigger like Action Comics, those tags would be way too resource intensive.

So, for bigger galleries, it's best to use {{c| instead of {{cid| or {{cis|, but for smaller ones, it isn't a big deal.