GNU bug report logs - #25682
25.1; font-lock: fontifying too slow in some modes on very long lines

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Package: emacs;

Reported by: Ryan B <public <at> ryanb.org>

Date: Fri, 10 Feb 2017 21:45:02 UTC

Severity: normal

Found in version 25.1

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ryan B <public <at> ryanb.org>
Cc: 25682 <at> debbugs.gnu.org
Subject: bug#25682: 25.1; font-lock: fontifying too slow in some modes on very long lines
Date: Sat, 23 Jul 2022 11:03:17 +0200

Ryan B <public <at> ryanb.org> writes:

> i occasionally have very long lines in some buffers, e.g. 10k-20k characters.
> font-lock-mode often hangs for a long time (5-10s) when fontifying these lines.

These issues have been fixed in Emacs 29 -- long lines no longer slows
down Emacs (to these degrees), so I'm closing this bug report.  (And I'm
not able to reproduce the problem in the test case here with the current
Emacs.)

There may be issues remaining with long lines, and if so, please open
new bug reports for those issues (and cases for reproduction would be
appreciated).
This bug report was last modified 2 years and 307 days ago.

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