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From: Richard Stallman <rms@gnu.org>
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Subject: Re: emacs hangs in jit-lock
Date: Tue, 28 Nov 2006 22:29:26 -0500
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Xref: news.gmane.org gmane.emacs.devel:63010
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    I am suffering from an Emacs performance problem: when I open "too many
    bad files" (say, total 10,000 lines of C code without a single #\{ or
    #\( in the first column), Emacs becomes unresponsive.

If you turn off stealth fontification, does the problem go away?