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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: M-x grep is too slow
Date: Tue, 20 Jul 2004 16:43:02 -0400
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    > Do you mean caching at the Lisp level inside Font-Lock mode?
    > That might be easy to do.

    I was thinking about doing it explicitly in compile.el...

Is this slowness in font-lock or is it in compile.el?