User blog comment:Kirkburn/Technical Update: March 3, 2015/@comment-5865360-20150304174953/@comment-126761-20150306011730

I knew there was a special page for this! Thanks, 452 :)

It is possible we'll be able to re-enable Category Exhibition on bigger categories in the future (and it would certainly be nice), but for the moment, the performance concerns are too pressing.