I'm experiencing extreme Emacs slowdown when VARIATION SELECTOR-16 char
is used somewhere in Emacs buffer. For example, I just executed:
(insert "a\xfe0f")
in *scratch* buffer. Moving cursor (when this char is visible) become
unbearable. Here is the results of cpu profiling:
- command-execute 776 62%
- call-interactively 776 62%
- funcall-interactively 675 54%
- previous-line 476 38%
- line-move 476 38%
- line-move-1 476 38%
+ vertical-motion 225 18%
- next-line 198 15%
- line-move 198 15%
- line-move-1 198 15%
+ vertical-motion 94 7%
+ execute-extended-command 1 0%
+ byte-code 101 8%
auto-compose-chars 185 14%
+ timer-event-handler 175 14%
- redisplay_internal (C function) 75 6%
auto-compose-chars 75 6%
- ... 30 2%
Automatic GC 30 2%
As I remember I did not experienced something similar in Emacs 26/27
Thanks
--------------------
In GNU Emacs 28.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.18.9, cairo version 1.14.6)
of 2020-01-13 built on wrt
Repository revision: 7c5d6a2afc6c23a7fff8456f506ee2aa2d37a3b9
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Ubuntu 16.04.1 LTS
Recent messages:
next-line: End of buffer [2 times]
Mark activated [2 times]
CPU profiler stopped
CPU profiler started
Mark set
Quit
Mark set
CPU profiler stopped
CPU profiler started
Mark set
Configured using:
'configure --with-modules --with-cairo'
Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY GNUTLS LIBXML2 FREETYPE HARFBUZZ LIBOTF ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 XDBE XIM MODULES THREADS JSON PDUMPER LCMS2 GMP
Important settings:
value of $LC_MONETARY: ru_RU.UTF-8
value of $LC_NUMERIC: ru_RU.UTF-8
value of $LC_TIME: ru_RU.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tracking-mode: t
telega-mode-line-mode: t
icomplete-mode: t
save-place-mode: t
pyvenv-mode: t
shell-dirtrack-mode: t
display-time-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
override-global-mode: t
cl-old-struct-compat-mode: t
global-eldoc-mode: t
eldoc-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t
auto-fill-function: do-auto-fill
transient-mark-mode: t
Load-path shadows:
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~/dev/xelb/xcb-renderutil hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-renderutil
~/dev/xelb/xcb-xinput hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xinput
~/dev/xelb/xcb-shape hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-shape
~/dev/xelb/xcb-icccm hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-icccm
~/dev/xelb/xcb-dri3 hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-dri3
~/dev/xelb/xcb-xc_misc hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xc_misc
~/dev/xelb/xcb-render hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-render
~/dev/xelb/xcb-xf86vidmode hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xf86vidmode
~/dev/xelb/xcb-cursor hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-cursor
~/dev/xelb/xcb-dri2 hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-dri2
~/dev/xelb/xcb-xprint hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xprint
~/dev/xelb/xcb-systemtray hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-systemtray
~/dev/xelb/xcb-composite hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-composite
~/dev/xelb/xcb-types hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-types
~/dev/xelb/xcb-dpms hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-dpms
~/dev/xelb/xcb-bigreq hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-bigreq
~/dev/xelb/xcb-xselinux hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xselinux
~/dev/xelb/xcb-xproto hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xproto
~/dev/xelb/xcb-xlib hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xlib
~/dev/xelb/xcb-xf86dri hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xf86dri
~/dev/xelb/xcb hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb
~/dev/xelb/xcb-xembed hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xembed
~/dev/xelb/xcb-present hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-present
~/dev/xelb/xcb-screensaver hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-screensaver
~/dev/xelb/xcb-shm hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-shm
~/dev/xelb/xcb-ge hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-ge
~/dev/xelb/xcb-xinerama hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xinerama
~/dev/xelb/xcb-xim hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xim
~/dev/xelb/xcb-damage hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-damage
~/dev/xelb/xcb-glx hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-glx
~/dev/xelb/xcb-sync hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-sync
~/dev/xelb/xcb-res hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-res
~/dev/xelb/xcb-xfixes hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xfixes
~/dev/xelb/xcb-xtest hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xtest
~/dev/xelb/xcb-keysyms hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-keysyms
~/dev/xelb/xcb-ewmh hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-ewmh
~/dev/xelb/el_client hides /home/lg/.emacs.d/elpa/xelb-0.18/el_client
~/dev/xelb/xcb-record hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-record
~/dev/xelb/xcb-xv hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xv
~/dev/xelb/xcb-randr hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-randr
~/dev/xelb/xcb-xkb hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xkb
~/dev/xelb/xcb-xevie hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xevie
~/dev/xelb/xcb-xvmc hides /home/lg/.emacs.d/elpa/xelb-0.18/xcb-xvmc
~/dev/xelb/xelb hides /home/lg/.emacs.d/elpa/xelb-0.18/xelb
Features:
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cc-mode cc-fonts cc-guess cc-menus cc-styles cc-align apropos profiler
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cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 844236 204685)
(symbols 48 53129 1)
(strings 32 212317 6977)
(string-bytes 1 7670144)
(vectors 16 104746)
(vector-slots 8 3029493 25214)
(floats 8 5990 341)
(intervals 56 26458 1076)
(buffers 1000 53)
(heap 1024 91340 6613))
--
lg