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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Q on performance with 10000 faces
Date: Mon, 22 May 2006 21:44:58 +0300
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 22 May 2006 08:59:13 -0400
> Cc: emacs-devel@gnu.org
> 
> >     It's because even cursor motion, that usually takes a fast shortcut
> >     through the redisplay code, requires to search all the text properties
> >     in your situation.
> 
> I don't see why that'd be the case.

Granted, I could only guess, since no actual code was posted, but the
description of the symptoms is quite revealing.