GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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Package: emacs;

Reported by: Gregory Heytings <gregory <at> heytings.org>

Date: Thu, 21 Jul 2022 18:01:01 UTC

Severity: normal

Done: Gregory Heytings <gregory <at> heytings.org>

Bug is archived. No further changes may be made.

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Message #143 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>,
 Eli Zaretskii <eliz <at> gnu.org>
Cc: 56682 <at> debbugs.gnu.org, gregory <at> heytings.org, monnier <at> iro.umontreal.ca
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Sun, 24 Jul 2022 17:35:19 +0300

On 24.07.2022 08:50, Gerd Möllmann wrote:
> Eli Zaretskii<eliz <at> gnu.org>  writes:
> 
>>> My bet is indeed on the mere presence of text properties, plus the
>>> fact that we need to merge faces.  But I could well be wrong.
> Can't say something about face merging, but "frequent" changes of faces
> certainly have an effect on iterator performance.  It stops, looks up
> properties again to determine the next stop pos, does what has to be
> done for current properties...

But the problem is contingent on having long lines, isn't it?

There must be some interplay between those circumstances. Not just 
having to look up faces (relatively) a lot.
This bug report was last modified 2 years and 8 days ago.

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