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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Stealth fontification GCs a lot
Date: Thu, 14 Apr 2005 12:20:53 -0400
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    But I see your point and I'll check if forcing the whole buffer to be
    fontified before folding leads to bearable execution times.

If it is too slow, here's another possible idea: explicitly handle
precisely and only the part of fontification that is needed for the
other features to work.  That might be substantially faster.