https://bugzilla.wikimedia.org/show_bug.cgi?id=41078

--- Comment #22 from Niklas Laxström <[email protected]> ---
It was slow on WMF too:

[23:45:38]  binasher> ^demon: i noticed that one of the enwiki slaves was
lagging a bunch and getting a bunch of ActiveUsersPager queries.. looks like an
uncommonly called page, but the query results in just about a full scan        
              of recentchanges with an on disk temp table
[23:46:03]  binasher> takes around 2 minutes on a busy server if all pages are
in the bufferpool
[23:46:08]  binasher> and 8 if not

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