From: Matt Lundin <mdl@imapmail.org>
To: Carsten Dominik <carsten.dominik@gmail.com>
Cc: Org Mode <emacs-orgmode@gnu.org>
Subject: Re: Slow movement in large buffers
Date: Tue, 15 Mar 2011 08:50:50 -0400 [thread overview]
Message-ID: <87oc5cy2c5.fsf@fastmail.fm> (raw)
In-Reply-To: <17242340-A14F-495A-B144-20C96D52B620@gmail.com> (Carsten Dominik's message of "Tue, 15 Mar 2011 12:18:51 +0100")
Carsten Dominik <carsten.dominik@gmail.com> writes:
> On Mar 15, 2011, at 4:25 AM, Matt Lundin wrote:
>
>> I've been navigating the org-issues file (14000+ lines) and have found
>> movement within the file to be fairly slow. Sometimes Emacs will lock up
>> for several seconds.
>>
>> For instance, to move from the level one heading "* Other" to "* Closed
>> issues" when the outline is folded takes over three seconds:
>>
>> --8<---------------cut here---------------start------------->8---
>> next-line 1 3.015289 3.015289
>> --8<---------------cut here---------------end--------------->8---
>>
>
> Wow, this is really bad.
> Could you use elp and instrument org, outline,
> and font-lock, and do that motion and report
> the results?
>
I instrumented those packages (along with next-line and previous-line)
and turned off flyspell. Unfortunately, it seems there is something else
involved, as previous-line is the only function registered by
elp-results:
--8<---------------cut here---------------start------------->8---
previous-line 1 2.524475 2.524475
--8<---------------cut here---------------end--------------->8---
This time, moving forward was faster than moving backward. The slowness
occurred when moving back from "* Other" to "* Development Tasks" in the
folded org-issues.org buffer. The movement jumped over a region
containing 4000 lines.
Since nothing from org or outline showed up in the results, I
instrumented the various functions called by previous-line. The culprit
seems to be a function written in C: vertical-motion. So this seems to
be an Emacs issue, rather than an org or outline issue.
--8<---------------cut here---------------start------------->8---
previous-line 1 2.5365349999 2.5365349999
line-move 1 2.536489 2.536489
line-move-visual 1 2.536436 2.536436
vertical-motion 1 2.508419 2.508419
font-lock-mode 1 3.7e-05 3.7e-05
line-move-partial 1 1.4e-05 1.4e-05
font-lock-default-function 1 9e-06 9e-06
window-hscroll 1 4e-06 4e-06
--8<---------------cut here---------------end--------------->8---
Best,
Matt
next prev parent reply other threads:[~2011-03-15 12:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-15 3:25 Slow movement in large buffers Matt Lundin
2011-03-15 5:03 ` Carsten Dominik
2011-03-15 12:51 ` Matt Lundin
2011-03-15 10:58 ` Eric S Fraga
2011-03-15 12:54 ` Matt Lundin
2011-03-15 14:09 ` Eric S Fraga
2011-03-15 17:42 ` Carsten Dominik
2011-03-15 11:18 ` Carsten Dominik
2011-03-15 12:33 ` Lawrence Mitchell
2011-03-15 12:50 ` Matt Lundin [this message]
2011-03-15 14:15 ` Nick Dokos
2011-03-15 15:51 ` Matt Lundin
2011-03-15 17:39 ` Carsten Dominik
2011-03-15 22:00 ` Christian Moe
2011-03-15 22:56 ` Nick Dokos
2011-03-15 23:13 ` Christian Moe
2011-03-16 3:48 ` Nick Dokos
2011-03-16 1:16 ` Bastien
2011-03-18 0:37 ` Matt Lundin
2011-03-15 16:11 ` Chris Randle
2011-03-15 16:41 ` MidLifeXis at PerlMonks
2011-03-15 17:14 ` Scott Randby
2011-03-15 17:18 ` Erik Iverson
2011-03-15 17:38 ` Carsten Dominik
2011-05-11 0:41 ` Carmine Casciato
2011-05-12 6:59 ` Eric S Fraga
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