https://bugzilla.wikimedia.org/show_bug.cgi?id=49362

--- Comment #8 from Bawolff (Brian Wolff) <[email protected]> ---
On Further investigation:
*On ?action=purge we purge all the thumbnails of old versions of the file. This
is very expensive if there are a lot of old versions (over 200 seems to get one
in to the territory of the request timing out)
*We originally started doing this for bug 30192, which seemed to add the purge
old thumbs overzealously. Its probably really only needed when deleting a file.
Additionally it appears that the code paths that actually need this purge
(except possibly for revdel) already do that via some other means as well.
*Commons users (I asked a small sample of users on irc) complain that often on
overwriting a file, cache is not purged initially, but ?action=purge works.
This isn't really consistent with the large-number-of-old-versions issue, so I
suspect that it is a separate issue.

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