bug#74337: closed (29.4; Visiting a file with Unicode emojis is very slow)

[GNU bug Tracking System]

Your message dated Sat, 30 Nov 2024 11:53:04 +0200
with message-id <864j3p9hfj.fsf@gnu.org>
and subject line Re: bug#74337: 29.4; Visiting a file with Unicode emojis is 
very slow
has caused the debbugs.gnu.org bug report #74337,
regarding 29.4; Visiting a file with Unicode emojis is very slow
to be marked as done.

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-- 
74337: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74337
GNU Bug Tracking System
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> --- Begin Message ---
>
>
>
> Subject: 
>
> 29.4; Visiting a file with Unicode emojis is very slow
>
>
>
>
> Date: 
>
> Wed, 13 Nov 2024 23:13:26 +1100
>
>
>
>
> User-agent: 
>
> mu4e 1.8.13; emacs 29.4
>
>
>
>
> It takes ~ 1.5 minutes to visit even a small file containing Unicode
> emojis, and CPU utilization goes to 100% (of a single core) while it is
> loading.
>
> Reproduction steps:
>
> 1. Open Emacs with `emacs -Q`.
> 2. Visit the attached file (known-hosts).
> 3. Observe that it takes > 1 minute to visit the file.
>
> In GNU Emacs 29.4 (build 1, amd64-portbld-freebsd14.1, GTK+ Version
> 3.24.43, cairo version 1.17.4)
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
> System Description: 14.1-RELEASE
>
> Configured using:
>  'configure --disable-build-details --localstatedir=/var --without-gconf
>  --without-libsystemd --without-selinux --with-x --enable-acl
>  --with-cairo --with-dbus --with-gif --with-gnutls --with-gsettings
>  --with-x-toolkit=gtk3 --with-harfbuzz --with-jpeg --with-json
>  --with-file-notification=kqueue --with-lcms2 --without-m17n-flt
>  --without-imagemagick --with-mailutils --with-modules
>  --without-native-compilation --with-sound=oss --without-libotf
>  --without-pgtk --with-png --with-toolkit-scroll-bars --with-sqlite3
>  --with-rsvg --with-threads --with-tiff --with-tree-sitter --with-webp
>  --without-xft --with-xim --with-xml2 --with-xpm --without-xwidgets
>  --x-libraries=/usr/local/lib --x-includes=/usr/local/include
>  --prefix=/usr/local --mandir=/usr/local/share/man
>  --disable-silent-rules --infodir=/usr/local/share/emacs/info/
>  --build=amd64-portbld-freebsd14.1 'CFLAGS=-O2 -pipe
>  -fstack-protector-strong -isystem /usr/local/include
>  -fno-strict-aliasing ' 'CPPFLAGS=-isystem /usr/local/include' 'LDFLAGS=
>  -fstack-protector-strong -L/usr/local/lib ''
>
> Configured features:
> ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
> LCMS2 LIBXML2 MODULES NOTIFY KQUEUE PDUMPER PNG RSVG SOUND SQLITE3
> THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2
> XPM GTK3 ZLIB
>
> Important settings:
>   value of $LC_ALL: en_AU.UTF-8
>   value of $LANG: C.UTF-8
>   locale-coding-system: utf-8-unix
>
> Major mode: Lisp Interaction
>
> Minor modes in effect:
>   tooltip-mode: t
>   global-eldoc-mode: t
>   eldoc-mode: t
>   show-paren-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   line-number-mode: t
>   indent-tabs-mode: t
>   transient-mark-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort mail-extr emacsbug message mailcap yank-media puny dired
> dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
> epg-config gnus-util text-property-search time-date subr-x mm-decode
> mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
> cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util
> mail-prsvr mail-utils rmc iso-transl tooltip cconv eldoc paren electric
> uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
> term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
> regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode
> prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
> timer select scroll-bar mouse jit-lock font-lock syntax font-core
> term/tty-colors frame minibuffer nadvice seq simple cl-generic
> indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
> tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
> romanian slovak czech european ethiopic indian cyrillic chinese
> composite emoji-zwj charscript charprop case-table epa-hook
> jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
> theme-loaddefs faces cus-face macroexp files window text-properties
> overlay sha1 md5 base64 format env code-pages mule custom widget keymap
> hashtable-print-readable backquote threads dbusbind kqueue lcms2
> dynamic-setting system-font-setting font-render-setting cairo
> move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
> emacs)
>
> Memory information:
> ((conses 16 37686 5905)
>  (symbols 48 5447 3)
>  (strings 32 13482 2173)
>  (string-bytes 1 385060)
>  (vectors 16 9591)
>  (vector-slots 8 160240 11894)
>  (floats 8 21 23)
>  (intervals 56 273 0)
>  (buffers 984 11))
>
> --
> Duncan Bayne
> +61 420 817 082 | gemini://duncan.bayne.id.au/
>
> I usually check my mail every 24 - 48 hours.  If there's something
> urgent going on, please send me an SMS or call me.
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#74337: 29.4; Visiting a file with Unicode emojis is very slow
>
>
>
>
> Date: 
>
> Sat, 30 Nov 2024 11:53:04 +0200
>
>
>
>
> > Cc: 74337@debbugs.gnu.org, rpluim@gmail.com
> > Date: Sat, 16 Nov 2024 15:22:51 +0200
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > From: Duncan Bayne <duncan@bayne.id.au>
> > > Cc: Eli Zaretskii <eliz@gnu.org>, 74337@debbugs.gnu.org
> > > Date: Sat, 16 Nov 2024 22:29:46 +1100
> > > 
> > > Installing Symbola "fixed" the issue - visiting the file is now almost
> > > instantaneous.
> > > 
> > > So it looks like the *actual* issue might be: visiting a file with a
> > > codepoint that doesn't match any installed fonts takes minutes?
> > 
> > Yes, but only if you have a very large number of fonts installed, none
> > of which supports that codepoint.  Because Emacs will try all of the
> > fonts that could potentially have a glyph for the codepoint.
>
> No further comments in 2 weeks, so I'm closing this bug.
>
>
> --- End Message ---