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>, monnier <at> iro.umontreal.ca
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Mon, 15 Aug 2022 20:53:12 +0000

>
> I said those words just as I was working on improving font-lock's 
> performance in JSON files. An effort which doesn't make sense if you 
> narrow around font-lock anyway.
>
> Also note that until now it has been impossible to improve redisplay of 
> big files by working on font-lock (other bottlenecks were much more 
> significant).
>

Wrong.  The (much more common) case of big files _without_ long lines, in 
which the same font locking slowdowns already exist, has AFAICS not been a 
sufficient incentive to improve font locking.

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