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bug#28795: 25.2; UTF-8 language environment causes extreme sluggishness
From: |
Eli Zaretskii |
Subject: |
bug#28795: 25.2; UTF-8 language environment causes extreme sluggishness |
Date: |
Thu, 12 Oct 2017 13:00:23 +0300 |
[Please keep the bug address on the CC list.]
> From: Mark Laws <mdl@60hz.org>
> Date: Thu, 12 Oct 2017 18:40:25 +0900
>
> On Thu, Oct 12, 2017 at 6:31 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> >> From: Mark Laws <mdl@60hz.org>
> >> Date: Thu, 12 Oct 2017 18:15:53 +0900
> >>
> >> M-x set-language-environment UTF-8
> >
> > On Windows, doing this is a mistake (but not because it causes
> > sluggish redisplay).
>
> What is the correct way to use UTF-8 as the default encoding for
> things like file-visiting buffers without causing other potential
> problems?
Put this in your .emacs:
(prefer-coding-system 'utf-8)
or even
(setq-default buffer-file-coding-system 'utf-8-dos)
(the latter doesn't affect process I/O).
> > I cannot reproduce this here. What font is used to display that
> > character? You can find this out with "C-u C-x =" with the cursor on
> > the character.
>
> uniscribe:-outline-PragmataPro
> Mono-normal-normal-normal-mono-15-*-*-*-c-*-iso8859-1 (#x8FC)
And which font is used if you don't set your language-environment to
UTF-8?
> If it doesn't work for you off the bat, do this after inserting the character:
>
> M-: (put-text-property 1 2 'face font-lock-warning-face)
>
> Then try moving around again.
Doesn't change anything here.
I do see slow redisplay on another system, where Symbola is not
installed, and the BatangChe font is then used. But there I see slow
redisplay whether or not I set the language-environment to UTF-8.
> > On my system, I have the Symbola font installed, which is used for
> > displaying this character, and the problem doesn't happen.
> >
> > As another thing to try, set inhibit-compacting-font-caches to a
> > non-nil value, and see if that helps.
>
> This seems to help
By "this" do you mean installing Symbola or setting
inhibit-compacting-font-caches non-nil?
> though the fact it only happens due to changes with encoding and/or
> font locking makes me suspicious.
It could be that the default language-environment causes a different
font to be used for that character.