User blog comment:DaNASCAT/Technical Update: September 25, 2012/@comment-732150-20120926234536

RC works when having a high number of edits set to display, but trying to see a page's history times out if it has more than the number of edit number selected. For example Korra's history times out for me with 2000 edits set to display in RC. It's something recent, because before 1.19, I had a much higher edit number set to display, and it did so without a hitch.