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Re: Relative performance of text-properties search functions


From: Thorsten Jolitz
Subject: Re: Relative performance of text-properties search functions
Date: Fri, 24 May 2013 16:10:04 +0200
User-agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.3 (gnu/linux)

Eli Zaretskii <eliz@gnu.org> writes:

>> 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.

I can imagine that in a .emacs with thousands of lines and hundreds of
headllines, redisplay of some headline cookies with every visibility
change will make Emacs work hard. 

-- 
cheers,
Thorsten




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