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From: Richard Stallman <rms@gnu.org>
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Subject: C-n is very slow in Font-Lock mode
Date: Sat, 23 Apr 2005 12:16:35 -0400
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With Font-Lock mode enabled, starting from the beginning of a large
file (such as fileio.c), C-n with a large argument (I tried C-u 2536
C-n) took many seconds.  I think it was fontifying all the text
that it moved across.

Can this be avoided?  I don't think C-n ought to need to fontify
all that text.

Even once it has fontified, the command still takes a lot longer
with Font-Lock mode enabled than it does with Font-Lock disabled.