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

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Message #1261 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 56682 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 monnier <at> iro.umontreal.ca
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 12 Aug 2022 12:34:54 +0000

>
> I've pushed a branch scratch/font_lock_large_files.
>

Thank you.  But as I told you earlier, what that branch contains is a too 
local fix.  You created a new minimal major mode to edit JSON files, in 
which you removed everything that made font locking slow in js-mode.  As a 
consequence, now editing the dictionary.json file is indeed reasonably 
fast without disabling font locking or using locked narrowing (although it 
is still too slow to my taste for larger files, e.g. I have to wait five 
seconds after M-> in a ten times larger JSON file).  And the original 
problem is still present if you edit, for example, a 20 MB minified 
JavaScript file...

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