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

Previous Next

Full log

Message #1279 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 56682 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 12 Aug 2022 22:01:54 -0400

> I can only repeat that the only ways to improve font locking in a non-local
> way (or at least, the only ways that were identified in the discussions so
> far) are either to improve the speed of syntax-ppss by an order of
> magnitude, in which case it would perhaps become feasible to allow
> syntax-ppss to have access to the whole buffer, or to equip syntax-ppss with
> heuristics to make it work "as well as possible" even when it only has
> access to a portion of the buffer.

But the locked narrowing is applied based on the presence of long-lines
rather than based on the total size of the buffer.

I think we'll want to decouple the two because they aren't quite the
same (e.g. in many cases the time taken by `syntax-ppss` doesn't depend
on the length of lines, whereas the time taken by `font-lock-keywords`
rues does not depend on the total buffer size).


        Stefan

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.