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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: Sun, 24 Apr 2005 17:23:07 -0400
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      JIT lock is optimized for C-v and similar methods that page
    by large chunks of text rather than by one line.

I am not sure what that means, in concrete terms of Lisp program
actions.  I'm also not sure what you mean by "make text visible".

It turns out that vertical-motion was fontifying all the text that
it moved over.  That seems to be easy to fix.