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From: Richard Stallman <rms@gnu.org>
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Subject: Re: C-n is very slow in Font-Lock mode
Date: Tue, 26 Apr 2005 06:05:41 -0400
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    > It turns out that vertical-motion was fontifying all the text that
    > it moved over.  That seems to be easy to fix.

    Did you try my suggestion of customizing jit-lock-defer-time?

No, because I want to fix this, not work around it.  vertical-motion
is a cursor motion function.  It should not fontify anything.