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

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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>, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 05 Aug 2022 13:41:11 +0000

>> What I'm not sure of is how useful is a "font-lock with arbitrary 
>> narrowing", where portions will be highlighted as strings rather than 
>> code (and vice-versa).  I don't have enough experience with it yet to 
>> be sure.  Taking a step back, I suspect that the only "real" solution 
>> is something like `jit-lock-defer` coupled with a way to perform the 
>> font-lock (and syntax-ppss/propertize) in the background.
>
> IIRC I heard that "some other editors" take the approach of restricting 
> syntax-highlighting to just the beginning of a large file.
>

Other editors just give up syntax highlighting altogether even with the 18 
MB file (and you cannot edit really large files with them).

But if you're so annoyed by mis-fontification, why don't you just turn 
font-lock mode off?

Also, why did you not protest vehemently when Stefan added 
syntax-wholeline-max, which also causes occasional mis-fontification?

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