"bzr log" by revision-id is slow

[Eli Zaretskii]

> From: Martin Pool <mbp at canonical.com>
> Date: Thu, 13 Oct 2011 09:26:53 +1100
> Cc: bazaar at lists.canonical.com
> 
> It ought to be possible to get a single revision in reasonable O(1)
> time, so I think something is wrong here.
> 
> In general if you hit something that looks unreasonably slow, please
> file a bug tagged 'performance affects-emacs', trying to make sure
> it's not already a dupe, with reproduction instructions and if
> possible the --lsprof-file output attached.

Done:

   https://bugs.launchpad.net/bzr/+bug/873248