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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Hideously slow VC status queries fixed
Date: Thu, 27 Dec 2007 13:24:21 -0500
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    parsing time could be an issue -- has anyone profiled 26,499 regexp
    matches lately ?

The speed of regexp matching depends greatly on the regexp itself.
If that regexp is slow, perhaps there is a much faster way
to parse that data.

Just turning off undo during the initial creation of that buffer's
contents will also speed it up somewhat, but I don't know if that is
significant.