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

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Message #637 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>, dgutov <at> yandex.ru
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 02 Aug 2022 03:51:02 -0400

> It is, indeed.  But here we are talking about big files (say 1 GB).  In that
> case (and in that case only) it is much better, from a user viewpoint, to
> wait say 20 seconds before the file is opened and being at that point able
> to freely move through the file, instead of waiting only 6 seconds, and then
> having to wait another 10 seconds between two motion commands like M-> C-p.
> In fact, no user expects that a 1 GB file would open instantaneously.

The problem will re-occur if you change something at the beginning of
the buffer and then go back to the end of the buffer.

I think something like `font-lock-defer` which displays the text
unfontified until we had time to apply the fontification should make the
1GB case much more usable (tho currently, it's probably not quite good
enough).


        Stefan

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