bug#9218: 24.0.50; bidi-display-reordering slowdown

[Florian Beck]

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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/usr/local/share/emacs/24.0.50/lisp/erc/erc-identd
/home/flo/.emacs.d/elpa/erc-5.3/erc-capab hides 
/usr/local/share/emacs/24.0.50/lisp/erc/erc-capab
/home/flo/.emacs.d/elpa/erc-5.3/erc-notify hides 
/usr/local/share/emacs/24.0.50/lisp/erc/erc-notify
/home/flo/.emacs.d/elpa/erc-5.3/erc-fill hides 
/usr/local/share/emacs/24.0.50/lisp/erc/erc-fill
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/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
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/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
w3-fast-parse w3-display w3-mouse w3-imap url-handlers w3-widget w3-vars
w3-keymap w3-cus css font devices ange-ftp w3-cfg w3-compat tabify
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
imap pop3 nndraft nnmh nnml nnfolder parse-time rot13 disp-table netrc
gnutls network-stream starttls tls gnus-agent gnus-srvr gnus-score
score-mode nnvirtual nntp gnus-cache smtpmail sendmail spam spam-stat
bbdb-com bbdb timezone gnus-uu yenc gnus-msg gnus-art mm-uu mml2015
mm-view mml-smime smime nnir gnus-sum gnus-group gnus-undo dig
gnus-propfont nnrss mm-url nnmail mail-source nnoo gnus-start gnus-spec
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
emms-fb emms-volume emms-volume-amixer emms-tag-editor emms-i18n
emms-mark emms-history emms-bookmarks emms-last-played emms-stream-info
emms-metaplaylist-mode emms-lastfm emms-url url url-proxy url-privacy
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
epa-file epa derived epg epg-config cfdg-mode generic org-fb
org-datetree org-id org-timer org-latex org-export-latex org-beamer
org-exp ob-exp org-exp-blocks org-agenda footnote org-capture org-mks
org-archive org-install ob-sqlite ob-sh shell ob-ruby ob-python
ob-gnuplot ob-latex ob-asymptote ob-dot ob-ditaa ob-R org byte-opt
warnings ob-emacs-lisp ob-tangle ob-ref ob-lob ob-table org-footnote
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