From: Eli Zaretskii <eliz@gnu.org>
To: Sujith <m.sujith@gmail.com>
Cc: 29889@debbugs.gnu.org
Subject: bug#29889: 27.0.50; Slow visual selection
Date: Fri, 29 Dec 2017 11:04:01 +0200 [thread overview]
Message-ID: <83tvw9gb26.fsf@gnu.org> (raw)
In-Reply-To: <87y3lmgphl.fsf@gmail.com> (message from Sujith on Fri, 29 Dec 2017 09:22:22 +0530)
> From: Sujith <m.sujith@gmail.com>
> Date: Fri, 29 Dec 2017 09:22:22 +0530
>
> Visual selection of text becomes very slow and hogs the
> CPU in some cases.
>
> For example, open the file lisp/progmodes/vhdl-mode.el in
> the emacs codebase. And then, to reproduce this issue:
>
> * Scroll patiently to the bottom using C-v.
> (this is essential, jumping to the bottom doesn't seem to bring
> up this issue).
> * Set mark with C-SPC.
> * Go to the beginning with M-<.
> * Now move the cursor up and down.
>
> The selection is jerky and CPU usage is very high.
> I have tried this with emacs -Q and can see the issue. I am using
> the master branch.
Confirmed. Additional info:
This happens also on the emacs-26 branch and in the 26.0.90 pretest,
but not in Emacs 25.2.
It also isn't limited to *.el files: I see it with, e.g., xterm.c.
The painfully slow first step can be replaced with this much simpler
step:
M-: (font-lock-fontify-region (point-min) (point-max)) RET
I guess some bisecting is in order.
next prev parent reply other threads:[~2017-12-29 9:04 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-29 3:52 bug#29889: 27.0.50; Slow visual selection Sujith
2017-12-29 9:04 ` Eli Zaretskii [this message]
2017-12-30 1:36 ` Sujith
2017-12-30 10:23 ` Eli Zaretskii
2017-12-31 5:25 ` Sujith
2017-12-31 7:20 ` Eli Zaretskii
2017-12-31 7:29 ` Eli Zaretskii
2018-01-06 1:15 ` Sujith
2018-01-06 8:37 ` Eli Zaretskii
2018-01-06 15:37 ` Stefan Monnier
2018-01-06 16:16 ` Eli Zaretskii
2018-01-07 15:24 ` bug#29889: [SUSPECTED SPAM] " Stefan Monnier
2018-01-07 16:08 ` martin rudalics
2018-01-07 17:36 ` Eli Zaretskii
2018-01-07 17:54 ` Stefan Monnier
2018-01-06 15:46 ` Sujith
2017-12-31 8:42 ` Sujith
2017-12-31 15:37 ` Eli Zaretskii
2017-12-31 18:43 ` Eli Zaretskii
2022-04-21 13:25 ` Lars Ingebrigtsen
2022-05-20 2:13 ` Lars Ingebrigtsen
2022-05-20 7:16 ` Eli Zaretskii
2022-05-20 9:07 ` Lars Ingebrigtsen
2022-05-20 8:35 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 8:39 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 11:02 ` Eli Zaretskii
2022-05-20 9:03 ` Lars Ingebrigtsen
2022-05-20 9:23 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 10:11 ` Lars Ingebrigtsen
2022-05-20 11:13 ` Eli Zaretskii
2022-05-20 11:32 ` Lars Ingebrigtsen
2022-05-20 11:47 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 12:13 ` Eli Zaretskii
2022-05-20 12:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 12:21 ` Eli Zaretskii
2022-05-20 12:47 ` Lars Ingebrigtsen
2022-05-20 13:19 ` Eli Zaretskii
2022-05-21 12:16 ` Lars Ingebrigtsen
2022-05-21 12:24 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-21 13:29 ` Lars Ingebrigtsen
2022-05-22 1:13 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-22 11:16 ` Lars Ingebrigtsen
2022-05-22 12:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-22 12:11 ` Lars Ingebrigtsen
2022-05-22 12:30 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-23 7:50 ` Lars Ingebrigtsen
2022-05-23 9:04 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-23 9:11 ` Lars Ingebrigtsen
2022-05-23 9:56 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 11:45 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 11:52 ` Lars Ingebrigtsen
2022-05-20 11:08 ` Eli Zaretskii
2022-05-20 11:51 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 12:19 ` Eli Zaretskii
2022-05-20 12:39 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 13:18 ` Eli Zaretskii
2022-05-20 13:27 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 11:03 ` Eli Zaretskii
2022-05-20 11:49 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-20 12:16 ` Eli Zaretskii
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