GNU bug report logs - #9218
24.0.50; bidi-display-reordering slowdown

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Florian Beck <abstraktion <at> t-online.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 20:45:27 +0200

I have a very large org-file (7.2MB, 6300 entries, 137k lines).

With 'bidi-display-reordering' set to nil, opening the file takes about
20s, `scroll-up-command' takes 1s.

With 'bidi-display-reordering' set to t, opening the file takes ore than
15 minutes, `scroll-up-command' takes about 2.5 minutes from the very
top.

The files contains many paragraphs (ie empty lines), but most of these
are hidden (folded). The first character in the file is »#«. So the buffer
looks like this:

#+STARTUP: overview

* Entry…
* Entry…
* Entry…
* Entry…
…

Some of the folded entries contain a couple of hundred lines; one
contains a couple of thousands.

[Just a data point, really. In my case, I can easily set
`bidi-display-reordering' to nil for that file, but others might
conceivably want to edit R-to-L text with org.]


In GNU Emacs 24.0.50.2 (x86_64-unknown-linux-gnu, X toolkit)
 of 2011-07-30 on flo-laptop
Windowing system distributor `The X.Org Foundation', version 11.0.11001000
configured using `configure  '--with-x-toolkit=lucid' 'CFLAGS=-march=core2 -msse2 -mssse3 -mcx16 -mfpmath=sse -O2 -pipe''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  diff-auto-refine-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: 0
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
<C-right> <C-right> <right> <C-backspace> <C-backspace> 
<C-backspace> <C-backspace> <C-backspace> <C-backspace> 
<C-backspace> <C-backspace> <C-backspace> <C-backspace> 
<C-backspace> b i f i - <backspace> <backspace> <backspace> 
d i - <tab> <f2> : SPC n i l C-x s <backspace> n M-x 
r e v e r <tab> t - b <tab> <return> y C-x C-g C-x 
k <return> C-o C-x b * s c <tab> <return> 2 3 s <backspace> 
<backspace> 4 s SPC i <backspace> w i t h o u t <return> 
<return> 2 0 : 0 3 : 1 5 <switch-frame> I f SPC y o 
u SPC r <backspace> a r e SPC u s d <backspace> i n 
g SPC t h e SPC c u r r e n z <backspace> t SPC b z 
r SPC v e r s i o n SPC o f SPC e m a c s , SPC m a 
k e SPC s u r e SPC t o SPC s e z t <backspace> <backspace> 
t <switch-frame> <f1> v <kp-end> <up> <up> <down> C-g 
<f1> v <help-echo> b i b d <backspace> i - d i <tab> 
<tab> <backspace> <backspace> <backspace> <backspace> 
<backspace> d i - d i <tab> C-SPC C-SPC <home> M-w 
C-g <switch-frame> SPC ` C-y ' SPC t o SPC n i l SPC 
( u n t i l SPC b i d i <C-backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> . <up> <up> <up> <up> <up> <up> <up> <C-right> 
<C-right> <down> <down> <down> <up> <C-left> <C-left> 
<C-left> <C-left> <C-left> <C-left> <C-left> c a n 
SPC M-x o r g - v e r s <tab> <return> <switch-frame> 
<switch-frame> C-c C-c q <up> <up> <return> <help-echo> 
<down> <return> <down> <return> <switch-frame> M-x 
r e p o r t - e m <tab> <return>

Recent messages:
Exiting summary buffer and applying spam rules
Retrieving newsgroup: gmane.emacs.devel...
Opening nntp server on news.gmane.org...done
Fetching headers for gmane.emacs.devel...done
Scoring...done
Generating summary...done
Saving file /home/flo/.newsrc-dribble...
Wrote /home/flo/.newsrc-dribble [2 times]
(Saved .newsrc-dribble)
Opening nntp server on news.gmane.org...done

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/home/flo/.emacs.d/elpa/erc-5.3/erc-ezbounce hides /usr/local/share/emacs/24.0.50/lisp/erc/erc-ezbounce
/home/flo/.emacs.d/elpa/erc-5.3/erc-log hides /usr/local/share/emacs/24.0.50/lisp/erc/erc-log
/home/flo/.emacs.d/elpa/erc-5.3/erc-goodies hides /usr/local/share/emacs/24.0.50/lisp/erc/erc-goodies
/home/flo/.emacs.d/elpa/erc-5.3/erc-join hides /usr/local/share/emacs/24.0.50/lisp/erc/erc-join
/home/flo/.emacs.d/elpa/erc-5.3/erc-imenu hides /usr/local/share/emacs/24.0.50/lisp/erc/erc-imenu
/home/flo/.emacs.d/elpa/emms-3.0/tq hides /usr/local/share/emacs/24.0.50/lisp/emacs-lisp/tq
/home/flo/.emacs.d/elpa/erc-5.3/erc-hecomplete hides /usr/local/share/emacs/24.0.50/lisp/obsolete/erc-hecomplete

Features:
(shadow emacsbug mailalias debug multi-isearch url-dav rect url-http
nnagent preview prv-emacs tex-buf font-latex latex tex-style tex
latexenc newcomment thingatpt grep face-remap bookmark w3-forms w3-style
w3-hot url-file url-dired w3-toolbar w3-emacs w3-props url-auth w3
w3-menu url-queue url-news url-irc url-gw w3-emulate w3-auto w3-parse
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mule-util flow-fill diff-mode jka-compr hippie-exp vc-git find-func
help-mode qp gnus-html browse-url url-cache ansi-color gnus-cite
mail-extr gnus-async gnus-bcklg gnus-ml gnus-topic utf-7 utf7 rfc2104
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gnus-int gnus-range gnus-win gnus gnus-ems view cal-iso cdlatex texmathp
image-file org-wl org-w3m org-vm org-rmail org-mhe org-mew org-irc
org-jsinfo org-infojs org-html org-info org-gnus org-docview org-bibtex
bibtex org-bbdb server session saveplace paren spell-number color-insert
overrides unicode-test my-font-settings fb-byte-compile zettelkasten
window-config outline-bar heisig logik robin refile fb-bibtex
my-skeletons my-emacs-extras re-builder message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader muse-bulletins wesnoth-fb
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emms-mark emms-history emms-bookmarks emms-last-played emms-stream-info
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url-expand url-methods url-history url-cookie url-util url-parse
auth-source eieio password-cache url-vars mailcap emms-browser sort
emms-playlist-sort emms-score emms-player-xine emms-player-mpd tq
emms-playing-time emms-lyrics emms-streams emms-mode-line emms-cache
emms-info-ogginfo emms-info-mp3info emms-info later-do
emms-playlist-mode emms-player-mplayer emms-player-simple
emms-source-playlist emms-source-file emms-setup emms emms-compat
calendar-fb cal-china lunar solar cal-dst cal-bahai cal-islam cal-hebrew
holidays hol-loaddefs appt diary-lib diary-loaddefs regexp-fb
typopunct-fb typopunct changelog-fb dired-fb dired file-props
format-spec crm keybindings cus-edit cus-start cus-load muse-publish
muse-project muse-protocols muse-regexps wid-edit muse muse-nested-tags
muse-mode pomodoro dictem-fb dictem timeclock uniquify command-frequency
elk-test two-mode-mode yank-match nnheader mm-util mail-prsvr mail-utils
gnus-util xml aspell-fb htmlize haskell-fb inf-haskell haskell-mode pp
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org-archive org-install ob-sqlite ob-sh shell ob-ruby ob-python
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org-src ob-comint ob-keys ob ob-eval org-pcomplete pcomplete org-list
org-faces org-compat org-entities org-macs noutline outline easy-mmode
cal-menu calendar cal-loaddefs settings-fb avoid package-fb
auctex-autoloads tex-site auto-complete-autoloads clojure-mode-autoloads
css-mode-autoloads emms-autoloads erc-autoloads htmlize-autoloads
kill-ring-search-autoloads lambdacalc-autoloads lua-mode-autoloads
perspective-autoloads rainbow-mode-autoloads slime-repl-autoloads
slime-autoloads w3-autoloads info yasnippet-bundle-autoloads
yasnippet-bundle dropdown-list advice help-fns advice-preload yasnippet
edmacro kmacro easymenu assoc cl package tabulated-list compile comint
regexp-opt ring bytecomp byte-compile cconv macroexp time-date tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer loaddefs button faces cus-face files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind dynamic-setting system-font-setting font-render-setting
x-toolkit x multi-tty emacs)

-- 
Florian Beck

Message #8 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Florian Beck <abstraktion <at> t-online.de>
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 21:51:13 +0300

> From: Florian Beck <abstraktion <at> t-online.de>
> Date: Mon, 01 Aug 2011 20:45:27 +0200
> 
> I have a very large org-file (7.2MB, 6300 entries, 137k lines).
> 
> With 'bidi-display-reordering' set to nil, opening the file takes about
> 20s, `scroll-up-command' takes 1s.
> 
> With 'bidi-display-reordering' set to t, opening the file takes ore than
> 15 minutes, `scroll-up-command' takes about 2.5 minutes from the very
> top.

Does setting bidi-paragraph-direction to left-to-right solve the
problem?

Message #11 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: abstraktion <at> t-online.de
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 22:00:31 +0300

> Date: Mon, 01 Aug 2011 21:51:13 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 9218 <at> debbugs.gnu.org
> 
> > From: Florian Beck <abstraktion <at> t-online.de>
> > Date: Mon, 01 Aug 2011 20:45:27 +0200
> > 
> > I have a very large org-file (7.2MB, 6300 entries, 137k lines).
> > 
> > With 'bidi-display-reordering' set to nil, opening the file takes about
> > 20s, `scroll-up-command' takes 1s.
> > 
> > With 'bidi-display-reordering' set to t, opening the file takes ore than
> > 15 minutes, `scroll-up-command' takes about 2.5 minutes from the very
> > top.
> 
> Does setting bidi-paragraph-direction to left-to-right solve the
> problem?

I meant without resetting bidi-display-reordering to nil, of course.

Message #14 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Florian Beck <abstraktion <at> t-online.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 9218 <at> debbugs.gnu.org, abstraktion <at> t-online.de
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 21:34:30 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Does setting bidi-paragraph-direction to left-to-right solve the
>> problem?
>
> I meant without resetting bidi-display-reordering to nil, of course.

The file opens just as fast as with bidi turned of, yes. Scrolling is
still somewhat erratic: scrolling down takes 12s the first time; then, after
`(beginning-of-buffer)' it only takes ~1s (as usual for that file). But I
can live with that.

But that still requires me to set a per file variable.

-- 
Florian Beck

Message #17 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Florian Beck <abstraktion <at> t-online.de>
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 22:38:28 +0300

> From: Florian Beck <abstraktion <at> t-online.de>
> Cc: abstraktion <at> t-online.de,  9218 <at> debbugs.gnu.org
> Date: Mon, 01 Aug 2011 21:34:30 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Does setting bidi-paragraph-direction to left-to-right solve the
> >> problem?
> >
> > I meant without resetting bidi-display-reordering to nil, of course.
> 
> The file opens just as fast as with bidi turned of, yes. Scrolling is
> still somewhat erratic: scrolling down takes 12s the first time

By "scrolling down" you mean all the way to the end, or just one
screenful?

> then, after `(beginning-of-buffer)' it only takes ~1s (as usual for
> that file). But I can live with that.
> 
> But that still requires me to set a per file variable.

I think Org Mode should set bidi-paragraph-direction in all its
buffers.  Can you see any disadvantages to such a solution?

Message #20 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Florian Beck <abstraktion <at> t-online.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 9218 <at> debbugs.gnu.org, Florian Beck <abstraktion <at> t-online.de>
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Mon, 01 Aug 2011 22:38:54 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Florian Beck <abstraktion <at> t-online.de>
>> Cc: abstraktion <at> t-online.de,  9218 <at> debbugs.gnu.org
>> Date: Mon, 01 Aug 2011 21:34:30 +0200
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> >> Does setting bidi-paragraph-direction to left-to-right solve the
>> >> problem?
>> >
>> > I meant without resetting bidi-display-reordering to nil, of course.
>> 
>> The file opens just as fast as with bidi turned of, yes. Scrolling is
>> still somewhat erratic: scrolling down takes 12s the first time
>
> By "scrolling down" you mean all the way to the end, or just one
> screenful?

`scroll-up-command'

And `end-of-buffer' takes the same time (12s vs 1s).

But it does not matter really. ANY command takes several seconds in that
buffer, e.g. C-h k <up> or C-x C-b – whereas they are instantanious with
bidi turned off.

In fact <NEXT> may even be slowed down because of fontification going on
(it only is slow the first time). Other commands are reproduciable.
Strange. C-h k is instantenious, but C-h k <up> takes several seconds to
complete. Happens also when selecting the other window (*Help*) with the mouse or
when running C-h k <up> in the other window.

Once the large buffer is no longer displayed in any window, the speed
returns to normal (as in before bidi).

>
>> then, after `(beginning-of-buffer)' it only takes ~1s (as usual for
>> that file). But I can live with that.
>> 
>> But that still requires me to set a per file variable.
>
> I think Org Mode should set bidi-paragraph-direction in all its
> buffers.  Can you see any disadvantages to such a solution?

Personally, no. People writing right-to-left prose might, though.

I just don't understand why it has to be that slow. I have paragraphs of
reasonable length. Is it because of the folded display? (But then there
are only some 6000 visible lines which should be fast in any case.) Org
mode does quite a bit of fontification, i.e. it already parses the
buffer. Is there a way for org mode to tell the display engine where a
new paragraph should be considered, what is to be displayed RtL or LtR,
etc?

-- 

Florian Beck

Message #23 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Florian Beck <abstraktion <at> t-online.de>
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Tue, 02 Aug 2011 01:40:45 -0400

> From: Florian Beck <abstraktion <at> t-online.de>
> Cc: Florian Beck <abstraktion <at> t-online.de>,  9218 <at> debbugs.gnu.org
> Date: Mon, 01 Aug 2011 22:38:54 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Florian Beck <abstraktion <at> t-online.de>
> >> Cc: abstraktion <at> t-online.de,  9218 <at> debbugs.gnu.org
> >> Date: Mon, 01 Aug 2011 21:34:30 +0200
> >> 
> >> Eli Zaretskii <eliz <at> gnu.org> writes:
> >> 
> >> >> Does setting bidi-paragraph-direction to left-to-right solve the
> >> >> problem?
> >> >
> >> > I meant without resetting bidi-display-reordering to nil, of course.
> >> 
> >> The file opens just as fast as with bidi turned of, yes. Scrolling is
> >> still somewhat erratic: scrolling down takes 12s the first time
> >
> > By "scrolling down" you mean all the way to the end, or just one
> > screenful?
> 
> `scroll-up-command'
> 
> And `end-of-buffer' takes the same time (12s vs 1s).
> 
> But it does not matter really. ANY command takes several seconds in that
> buffer, e.g. C-h k <up> or C-x C-b – whereas they are instantanious with
> bidi turned off.

And this slowdown happens only on the first command, as you said
earlier?  Or on subsequent commands as well?

> In fact <NEXT> may even be slowed down because of fontification going on
> (it only is slow the first time). Other commands are reproduciable.

"Reproducible" meaning that they are slow not only the first time?  Or
does it mean something else?

> Strange. C-h k is instantenious, but C-h k <up> takes several seconds to
> complete. Happens also when selecting the other window (*Help*) with the mouse or
> when running C-h k <up> in the other window.

I'd expect the slowdown to happen whenever the window showing that Org
buffer needs to be redisplayed.  "C-h k" just displays the prompt in
the echo area, so the Org window needs not be redisplayed.  "C-h k
<up>" pops up another window, which changes the dimensions of the Org
window, and that window needs to be redisplayed.  Emacs tries very
hard to optimize the redisplay, because redisplaying everything would
be painfully slow.  That is the reason of what you see, IIUC.

> Once the large buffer is no longer displayed in any window, the speed
> returns to normal (as in before bidi).

Of course: a buffer not shown in any window does not affect redisplay
in any way.

> >> But that still requires me to set a per file variable.
> >
> > I think Org Mode should set bidi-paragraph-direction in all its
> > buffers.  Can you see any disadvantages to such a solution?
> 
> Personally, no. People writing right-to-left prose might, though.

Why would they?  setting bidi-paragraph-direction does not disable
reordering of R2L text, it just makes all Org entries start at the
left margin.

> I just don't understand why it has to be that slow. I have paragraphs of
> reasonable length. Is it because of the folded display?

Probably, but that's a guess, and I'm not very good at guessing when
the display engine is involved.

I don't suppose you can ship me that file for playing with it?  If
not, I will try to generate such a huge file and see if I get such
slowdown.  My Org files are much shorter (around 1.5K lines overall),
and I don't see any slowdown at all, even though I have Flyspell mode
turned on in them.

> (But then there are only some 6000 visible lines which should be
> fast in any case.)

The display engine has no way of knowing which parts are visible and
which aren't, until it actually traverses all of that text and takes
notice of the `invisible' text properties, selective-display, and
other display features.  This is much slower than just scanning buffer
text, and somehow the paragraph direction detection comes into play
during this in a way that slows things down unbearably...

> Org mode does quite a bit of fontification, i.e. it already parses
> the buffer.

Fontification pays attention only to a few text properties, while
redisplay needs to cater to much more.

> Is there a way for org mode to tell the display engine where a new
> paragraph should be considered, what is to be displayed RtL or LtR,
> etc?

How can it do that without running the same code that the bidi display
runs, and which is the cause of the slowdown?  The rules of
determining the paragraph direction are spelled out by an annex to the
Unicode Standard (http://unicode.org/reports/tr9/#The_Paragraph_Level),
and bidi.c includes its full implementation.  Any piece of code that
tries to do the same will be hit with the same slowness.

IOW, to solve this problem without the need to set
bidi-paragraph-direction non-nil, I need either (a) find a bug in the
current bidi display that makes paragraph detection so slow in this
case, or (b) find some way to optimize the paragraph detection so it
runs faster or is invoked less in most cases like this one.

Message #26 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: abstraktion <at> t-online.de
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Tue, 02 Aug 2011 05:01:53 -0400

> Date: Tue, 02 Aug 2011 01:40:45 -0400
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 9218 <at> debbugs.gnu.org
> 
> I don't suppose you can ship me that file for playing with it?

No need: I made a dummy Org file of a considerable size, and I see the
slowdown there already.

Message #31 received at 9218-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: abstraktion <at> t-online.de
Cc: 9218-done <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Tue, 02 Aug 2011 22:20:10 +0300

> Date: Tue, 02 Aug 2011 05:01:53 -0400
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 9218 <at> debbugs.gnu.org
> 
> > Date: Tue, 02 Aug 2011 01:40:45 -0400
> > From: Eli Zaretskii <eliz <at> gnu.org>
> > Cc: 9218 <at> debbugs.gnu.org
> > 
> > I don't suppose you can ship me that file for playing with it?
> 
> No need: I made a dummy Org file of a considerable size, and I see the
> slowdown there already.

Please try trunk revision 105387 (leaving bidi-paragraph-direction at
its default nil value).  I think I fixed this problem.

Feel free to reopen the bug, if there are any leftovers.

Thanks.

Message #34 received at 9218 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Florian Beck <abstraktion <at> t-online.de>
Cc: 9218 <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Tue, 02 Aug 2011 22:25:24 +0300

> From: Florian Beck <abstraktion <at> t-online.de>
> Cc: Florian Beck <abstraktion <at> t-online.de>,  9218 <at> debbugs.gnu.org
> Date: Mon, 01 Aug 2011 22:38:54 +0200
> 
> I just don't understand why it has to be that slow. I have paragraphs of
> reasonable length.

It turns out the problem was with looking for possible display
properties and strings (text covered by them is reordered as a single
entity).  This searched to the end of the humongous buffer every time
Emacs needed to determine paragraph direction.  There was a cache that
should have prevented all such searches but the first one, but Org
mode caused that cache to be invalidated due to its display tricks.
Plus, since the display is folded, what shows on the screen as 50
innocent lines actually hides 50 paragraphs, which means Emacs did
that long search 50 times...

To fix this, I dropped the simplistic cache, and instead introduced
machinery that searches at most 5K characters forward.

Message #35 received at 9218-done <at> debbugs.gnu.org (full text, mbox):

From: Florian Beck <abstraktion <at> t-online.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 9218-done <at> debbugs.gnu.org, abstraktion <at> t-online.de
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Wed, 03 Aug 2011 18:35:18 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Tue, 02 Aug 2011 05:01:53 -0400
>> From: Eli Zaretskii <eliz <at> gnu.org>
>> Cc: 9218 <at> debbugs.gnu.org
>> 
>> > Date: Tue, 02 Aug 2011 01:40:45 -0400
>> > From: Eli Zaretskii <eliz <at> gnu.org>
>> > Cc: 9218 <at> debbugs.gnu.org
>> > 
>> > I don't suppose you can ship me that file for playing with it?
>> 
>> No need: I made a dummy Org file of a considerable size, and I see the
>> slowdown there already.
>
> Please try trunk revision 105387 (leaving bidi-paragraph-direction at
> its default nil value).  I think I fixed this problem.
>
> Feel free to reopen the bug, if there are any leftovers.

Sorry for the delay.

Yes this seems to fix the problem. Speed is pretty much as before.
Great!

Thanks as lot!


-- 
Florian Beck

Message #36 received at 9218-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Florian Beck <abstraktion <at> t-online.de>
Cc: 9218-done <at> debbugs.gnu.org
Subject: Re: bug#9218: 24.0.50; bidi-display-reordering slowdown
Date: Wed, 03 Aug 2011 19:53:31 +0300

> From: Florian Beck <abstraktion <at> t-online.de>
> Cc: abstraktion <at> t-online.de,  9218-done <at> debbugs.gnu.org
> Date: Wed, 03 Aug 2011 18:35:18 +0200
> 
> Yes this seems to fix the problem. Speed is pretty much as before.
> Great!

Thanks for helping me in finding this bug.

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