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* bug#40384: 26.3; [Windows10] variable-pitch-mode is slow to redraw
@ 2020-04-02  0:06 gennady.uraltsev
  2020-04-02 14:40 ` Eli Zaretskii
  0 siblings, 1 reply; 8+ messages in thread
From: gennady.uraltsev @ 2020-04-02  0:06 UTC (permalink / raw)
  To: 40384

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I am trying to emacs under Windows 10. variable-pitch-mode is insanely slow
in redrawing the screen. With a clean emacs.d I opened a text file and tried
pressing the down arrow. The cursor gets redisplayed every 10 lines or so
and emacs is very sluggish. It is interesting that this DOES NOT happen with
a normal, fixed-pitch, font and also does NOT happen if I set the default
font to be a variable pitch one e.g. "Segoe UI". It only happens with
variable-pitch-mode.

The same problem appears with all win32 versions of emacs that I found:

the cygwin emacs-32 package

$ uname -a
CYGWIN_NT-10.0 malevich 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
$ emacs-w32.exe --version
GNU Emacs 26.3

the official package:

$ emacs.exe --version
GNU Emacs 26.3

and with NTEmacs. 

Also, interestingly enough, page by page movement with pg-down with
variable-pitch-mode seems ok and snappy. No fontification is active in my
attempts as I opened everything in fundamental mode.


Specifically, to reproduce start a clean emacs, dismiss the startup
screen and yank copies of the first two lines of the scratch buffer to
fill in your screen: 35 lines? Now execute: M-x variable-pitch-mode and
try moving around using arrow keys (up and down). The system slows down
and starts updating once every 0.5 -1 sec if you hold down/ input
movement keys consecutively. This does not happen on X11 builds.

If you change font, this problem still remains. Attached are 
profiler results for moving down two pages worth of text. 



In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29 built on CIRROCUMULUS
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
Recent messages:
Buffer-Face mode enabled
funcall-interactively: End of buffer [3 times]
C-h C-g is undefined
Making completion list...
Type C-x 1 to delete the help window, C-M-v to scroll help.
previous-line: Beginning of buffer [65 times]
scroll-up-command: End of buffer
next-line: End of buffer [2 times]
Making completion list...
scroll-up-command: End of buffer

Configured using:
 'configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS THREADS LCMS2

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1251

Major mode: Lisp Interaction

Minor modes in effect:
  buffer-face-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
mml-sec password-cache epa derived epg epg-config gnus-util rmail
rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils pp wid-edit descr-text help-mode easymenu
cl-loaddefs cl-lib face-remap elec-pair time-date mule-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
dos-w32 ls-lisp disp-table term/w32-win w32-win w32-vars term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
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 charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads w32notify w32
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 104193 13728)
 (symbols 48 32234 1)
 (miscs 40 63 381)
 (strings 32 86233 1404)
 (string-bytes 1 1941437)
 (vectors 16 15512)
 (vector-slots 8 899538 14224)
 (floats 8 63 228)
 (intervals 56 417 52)
 (buffers 992 14))

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0x1000cdbc3>" font-lock-fontify-keywords-region font-lock-default-fontify-region font-lock-fontify-region "#<compiled 0x100251d39>" run-hook-wrapped jit-lock--run-functions jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil nil nil nil] 1138 [lisp--match-hidden-arg font-lock-fontify-keywords-region font-lock-default-fontify-region font-lock-fontify-region "#<compiled 0x100251d39>" run-hook-wrapped jit-lock--run-functions jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil nil nil nil] 4224 [jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil nil nil nil nil nil nil nil nil nil nil] 2112 [replace-regexp-in-string font-lock-fontify-syntactically-region font-lock-default-fontify-region font-lock-fontify-region "#<compiled 0x10027d071>" run-hook-wrapped jit-lock--run-functions jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil nil nil nil] 1056 [file-remote-p redisplay_internal\ \(C\ function\) nil nil nil nil nil nil nil nil nil nil nil nil nil nil] 5580 [window-current-scroll-bars window-edges window-inside-pixel-edges line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil] 5280 [window-edges window-inside-pixel-edges window-screen-lines line-move-partial line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil] 1056 [window-current-scroll-bars window-edges window-inside-pixel-edges line-move-partial line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil] 2112 [line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil nil] 1056 [minibuffer-inactive-mode read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil] 1056 [completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 17632 [minibuffer-history-isearch-setup read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil] 1056 [read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil nil] 68946 [redisplay_internal\ \(C\ function\) read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil] 3168 [image-search-load-path find-image redisplay_internal\ \(C\ function\) read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil] 2520 [if eval redisplay_internal\ \(C\ function\) read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil] 16896 [timer-relative-time run-at-time apply run-with-timer blink-cursor--start-timer blink-cursor-start apply timer-event-handler read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil] 1056 [call-interactively command-execute read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil] 192 [completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil] 1056 [timer--time-less-p timer--activate timer-activate-when-idle timer-event-handler read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil] 1056 [complete-with-action "#<compiled 0x1000a9d03>" all-completions completion-pcm--all-completions completion-basic-all-completions "#<compiled 0x13205f1>" completion--some completion--nth-completion completion-all-completions minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region] 1056 [font-lock-prepend-text-property "#<compiled 0x1321a05>" mapcar completion-hilit-commonality completion-basic-all-completions "#<compiled 0x13205f1>" completion--some completion--nth-completion completion-all-completions minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region] 5160 [temp-buffer-window-setup minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read] 1040 [temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read] 1056 [window-in-direction "#<compiled 0x13211fd>" walk-window-tree-1 walk-window-tree display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete] 16 [if eval posn-at-point window-in-direction "#<compiled 0x13211fd>" walk-window-tree-1 walk-window-tree display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>"] 2112 [window-in-direction "#<compiled 0x13211fd>" walk-window-tree display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively] 1056 [display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer] 4224 [window--try-to-split-window display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute] 1056 [split-window split-window-no-error display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively] 382393 [window--display-buffer display-buffer-at-bottom display-buffer temp-buffer-window-show minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute] 1377 [minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read read-extended-command] 80 [display-completion-list minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read] 4224 [completion--insert-strings display-completion-list minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default] 4064 [completion-list-mode completion-setup-function run-hooks display-completion-list minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute] 1096 [completion-setup-function run-hooks display-completion-list minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer] 75336 [fit-window-to-buffer minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer completing-read-default completing-read] 2112 [window-resize window-resize-no-error fit-window-to-buffer minibuffer-completion-help completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x131d9c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer] 321 [map-keymap keymap-canonicalize redisplay_internal\ \(C\ function\) read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil] 1056 [timer--time-less-p timer--activate timer-activate run-at-time apply run-with-timer blink-cursor--start-timer blink-cursor-start apply timer-event-handler read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively] 1056 [delete-window window--delete bury-buffer minibuffer-hide-completions completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x1e978c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively command-execute read-from-minibuffer] 321 [get-mru-window delete-window-internal delete-window window--delete bury-buffer minibuffer-hide-completions completion--do-completion completion--in-region-1 "#<compiled 0x1000a72cf>" apply "#<compiled 0x1e978c5>" completion--in-region completion-in-region minibuffer-complete funcall-interactively call-interactively] 1056 [internal-timer-start-idle read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil] 1677 [execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil nil nil] 47048 [call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 16 [profiler-cpu-profile profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil] 1878752 [profiler-make-profile profiler-cpu-profile profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil] 1677 [profiler-report-make-buffer-name profiler-report-setup-buffer-1 profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil] 32 [profiler-report-setup-buffer-1 profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil] 1040 [replace-regexp-in-string profiler-report-header-line-format profiler-report-render-calltree-1 profiler-report-rerender-calltree profiler-report-render-calltree profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute] 524 [profiler-report-insert-calltree mapc profiler-report-insert-calltree-children profiler-report-render-calltree-1 profiler-report-rerender-calltree profiler-report-render-calltree profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively] 8188 [mapc profiler-report-insert-calltree-children profiler-report-render-calltree-1 profiler-report-rerender-calltree profiler-report-render-calltree profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute] 1016 [profiler-report-move-to-entry profiler-report-render-calltree-1 profiler-report-rerender-calltree profiler-report-render-calltree profiler-report-setup-buffer profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil] 704 [split-window split-window-below split-window-sensibly window--try-to-split-window display-buffer-pop-up-window display-buffer--maybe-pop-up-frame-or-window display-buffer pop-to-buffer switch-to-buffer-other-window profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command] 378257 [window--display-buffer display-buffer-pop-up-window display-buffer--maybe-pop-up-frame-or-window display-buffer pop-to-buffer switch-to-buffer-other-window profiler-report-profile-other-window profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute] 364737 [profiler-memory-profile profiler-report-memory profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil] 1887024)) (24197 11087 803461 0) nil]

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2022-01-21 13:38 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-02  0:06 bug#40384: 26.3; [Windows10] variable-pitch-mode is slow to redraw gennady.uraltsev
2020-04-02 14:40 ` Eli Zaretskii
2020-04-02 22:29   ` gennady.uraltsev
2020-04-03  7:04     ` Eli Zaretskii
2020-04-08 15:30       ` Gennady Uraltsev
2020-04-08 15:38         ` Eli Zaretskii
2021-12-05  1:16         ` Lars Ingebrigtsen
2022-01-21 13:38           ` Lars Ingebrigtsen

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