Re: Slow movement in large buffers

[Eric S Fraga <e.fraga@ucl.ac.uk>]

Matt Lundin <mdl@imapmail.org> writes:

> 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:
>
> next-line     1           3.015289      3.015289
>
> In my experience, the maximum workable size of org files is around
> 10,000 lines. Beyond that, Emacs starts to spin its wheels.
>
> Do others have the same experience? If so, does anyone have any tips on
> how to diagnose this further?
>
> (insert "\n" emacs-version)
> 23.3.1
>
> (insert "\n" org-version)
> 7.5
>
> Best,
> Matt
>
>  

Interesting.  It doesn't take 3 seconds on my system (Intel(R)
Pentium(R) D CPU 2.80GHz) but there is a noticeable delay using C-n to
move from =* Other= to =* Closed issues=.  However, using C-cC-n to move
has no delay at all and moving backwards (either C-p or C-cC-p) also
exhibits no delay.

I have noticed significant slowness in some of my own files lately when
including babel source code blocks, especially latex ones.  But I
haven't been able to reproduce this slowness predictably enough to
instrument it and hence report it in any useful sense... still
experimenting.

-- 
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.50.1
: using Org-mode version 7.5 (release_7.5.38.gf8c6.dirty)