--- Begin Message ---
|
Subject: |
25.1; Possible inefficiency in UTF-8 |
|
Date: |
Tue, 15 Nov 2016 23:25:35 -0500 |
In an empty buffer, insert a pile of "foo" lines (a few screens high),
in the middle, add the result of (insert #x23ce) (to get the unicode
character). Now `C-x RET l' and "UTF-8". Now, just moving the cursor
around in the buffer shows very noticeable delays, up to more than a
second. In the default language of "English" I don't see that
happening. This is on a Windows 7 machine.
In GNU Emacs 25.1.1 (x86_64-w64-mingw32)
of 2016-09-17 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 6.1.7601
Configured using:
'configure --without-dbus --without-compress-install CFLAGS=-static'
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS
Important settings:
value of $LC_COLLATE: POSIX
value of $LANG: en_US.UTF-8
locale-coding-system: cp1252
Major mode: Text
Minor modes in effect:
tooltip-mode: t
global-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
Recent messages:
next-line: End of buffer [9 times]
previous-line: Beginning of buffer [6 times]
Mark set [90 times]
previous-line: Beginning of buffer [10 times]
You can run the command ‘set-language-environment’ with C-x RET l
Auto-saving...done
next-line: End of buffer [11 times]
previous-line: Beginning of buffer [10 times]
next-line: End of buffer [9 times]
Making completion list...
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message idna dired format-spec rfc822
mml mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
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 charscript
case-table epa-hook jka-cmpr-hook help simple abbrev 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 w32notify w32 multi-tty
make-network-process emacs)
Memory information:
((conses 16 91694 5152)
(symbols 56 19958 0)
(miscs 48 116 129)
(strings 32 16382 3241)
(string-bytes 1 443818)
(vectors 16 11828)
(vector-slots 8 426659 5914)
(floats 8 164 74)
(intervals 56 442 840)
(buffers 976 25))
--
((x=>x(x))(x=>x(x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#24953: 25.1; Possible inefficiency in UTF-8 |
|
Date: |
Wed, 16 Nov 2016 18:17:42 +0200 |
> From: Eli Barzilay <address@hidden>
> Date: Tue, 15 Nov 2016 23:25:35 -0500
>
> In an empty buffer, insert a pile of "foo" lines (a few screens high),
> in the middle, add the result of (insert #x23ce) (to get the unicode
> character). Now `C-x RET l' and "UTF-8".
Regardless of the issue reported here, I would advise against setting
the UTF-8 language environment on MS-Windows. Doing so is likely to
screw you in some situations. For example, that sets up the encoding
of communications with subprocesses to use UTF-8, something that only
works with pure ASCII text and command-line arguments, and breaks
otherwise on Windows.
You shouldn't need to do this, not in Emacs 25 anyway.
> Now, just moving the cursor around in the buffer shows very
> noticeable delays, up to more than a second. In the default
> language of "English" I don't see that happening. This is on a
> Windows 7 machine.
Fixed on the emacs-25 branch. The reason was sub-optimal definition
of the default fontset wrt to fonts that cover symbols and punctuation
Unicode blocks.
Thanks.
--- End Message ---