GNU bug report logs - #57207
29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)

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Message #284 received at 57207 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: larsi <at> gnus.org, 57207 <at> debbugs.gnu.org, yantar92 <at> gmail.com
Subject: Re: bug#57207: 29.0.50; Fontification is slow after e7b5912b23
 (Improvements to long lines handling)
Date: Mon, 22 Aug 2022 14:00:34 +0000

>
> However, resetting the narrowing in _all_ buffers at the beginning of 
> each redisplay cycle could be quite expensive in sessions with many 
> hundreds of live buffers.
>

Actually, we only reset the locked narrowing in all buffers.  An Emacs 
session would typically only have a handful of live buffers in which such 
a narrowing is used, i.e. a small fraction of the live buffers.

>
> How much time does the loop in reset_outermost_narrowings take per live 
> buffer?
>

About 150 ns/buffer here.  I'll see whether and how it could be improved.

>
> Should we perhaps maintain a list of buffers with such narrowing?  It 
> should be a very short list.
>

That's one possibility indeed.

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