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

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Package: emacs;

Reported by: Gregory Heytings <gregory <at> heytings.org>

Date: Thu, 21 Jul 2022 18:01:01 UTC

Severity: normal

Done: Gregory Heytings <gregory <at> heytings.org>

Bug is archived. No further changes may be made.

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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: bug#56682: Fix the long lines font locking related slowdowns
Date: Mon, 01 Aug 2022 07:06:21 -0400

> The problem is that this is, as I said, slow.  On my laptop, opening a 1 GB
> file takes about 6 seconds.  The call to syntax-ppss adds 70 seconds, so
> opening a large file becomes an order of magnitude slower (13 times slower).

It's meaningless to talk about the time taken by `syntax-ppss` without specifying
the major mode that was in use.
You might also want to compare to the time to run

    (parse-partial-sexp (point-min) (point-max))

which is a kind of "speed of light" for `syntax-ppss`.


        Stefan
This bug report was last modified 2 years and 8 days ago.

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