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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Relative performance of text-properties search functions
Date: Thu, 23 May 2013 18:45:45 +0300
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> From: Thorsten Jolitz <tjolitz@gmail.com>
> Date: Thu, 23 May 2013 14:16:47 +0200
> 
> the right thing to do (from a performance point of view) in a case where
> at the end of each outline (or org-mode) headline in a buffer a
> replacing display spec should be inserted, and then updated many times
> afterwards (either on user demand or via a visibility-change hook):

Beware: too many replacing display specs will slow down redisplay in
Emacs 24.1 and later.  If you have alternatives, consider them first.