Email notifications used to be instant, now they're taking about 20 minutes on en.wiki (with only 60 thousands jobs in the queue).
Not only this shows some problem with the job queue system and it's a non-small regression, but it's also very confusing because I'm sent notifications when they're already obsoleted (for instance because I already replied).
Dear Nemo bis,
The Wikipedia page User talk:Nemo bis has been changed on 13 January 2013
by anonymous user 76.126.142.118, see
http://en.wikipedia.org/wiki/User_talk:Nemo_bis for the current
revision.
See
http://en.wikipedia.org/w/index.php?title=User_talk:Nemo_bis&diff=next&oldid=532890436
to view this change.
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To: Nemo bis
Subject: Wikipedia page User talk:Nemo bis has been changed by anonymous user 76.126.142.118
From: MediaWiki Mail <wiki@wikimedia.org>
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Date: Sun, 13 Jan 2013 20:01:28 +0000
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See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=55822