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Subject: bug#71454: 30.0.50; Performance issues with font selection
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From: Kai Ma <justksqsf@HIDDEN>
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Recently, I have the need of editing files with extraordinary ranges of
Unicode code points, and the performance problem with font selection
becomes too obvious to ignore.
I have currently (length (font-family-list)) =3D 582 font families
installed. And whenever I input some ununsual characters, Emacs will
freeze for seconds until I am able to do anything else. Worse, the
freeze delay for each character will add up. And whenver the face
changes (including hl-line-mode), or I switched to another buffer for
some time, there will be a delay again.
I'm pretty sure this is due to font selection, because Emacs won't
freeze if I configure manually the fallback fonts for each 'exotic'
script I encounter.
For testing, there are some such characters in my file:
=E3=80=A1=E3=80=A2=E3=80=A3=E3=80=A4=E3=80=A5=E3=80=A6=E3=80=A8=E3=80=A9=E3=
=80=B8=E3=80=B9=E3=80=BA
[=C5=AB, =C3=BA, =C5=B1, =C7=94, =C3=B9, =C8=95, =C3=BB, =C5=AD, =C8=97, =
=C3=BC, =C7=96, =C7=98, =C7=9A, =C7=9C, =C5=AF, =C5=A9, =E1=B5=A4, =E1=B5=98=
, =CA=89, =E1=B6=B6, =E1=BB=A7, =C5=B3, =E1=B9=B7, =E1=BB=A5,
=E1=B9=B3, =E1=B9=B5, =C6=B0, =CA=8A, =E1=B6=B7, =E1=B5=BF, =E1=B6=99, =
=E1=B9=BB, =E1=B9=B9, =E1=BB=A9, =E1=BB=AB, =E1=BB=AF, =E1=BB=AD, =E1=BB=B1=
, =EA=AD=92, =EA=AD=9F, =EA=9D=B8, =EA=AD=8E, =EA=AD=8F, =E1=B4=9D, =E1=B5=
=99, =E1=B4=9E]
[=C3=BC, =C7=96, =C7=98, =C7=9A, =C7=9C, =E1=B9=BD, =E1=B5=9B, =E1=B5=A5, =
=E1=B9=BF, =EA=9D=9F, =CA=8B, =E1=B6=B9, =E1=B6=8C, =E2=B1=B4, =E2=B1=B1, =
=E1=BB=BD, =CA=8C, =E1=B6=BA]
[=C3=9C, =C7=95, =C7=97, =C7=99, =C7=9B, =E1=B9=BC, =E1=B4=A0, =E2=B1=BD, =
=E1=B9=BE, =EA=9D=9E, =C6=B2, =E1=BB=BC, =C9=85 ]
[ =E2=82=80, =E2=82=81, =E2=82=82, =E2=82=83, =E2=82=84, =E2=82=85, =E2=82=
=86, =E2=82=87, =E2=82=88, =E2=82=89, =E2=82=8A, =E2=82=8B, =E2=82=8C, =
=E2=82=8D, =E2=82=8E, =E2=80=B8, =E1=B4=80, =E2=82=90, =E1=B4=81, =CA=99, =
=E1=B4=83, =E1=B5=A6, =E1=B4=84, =E1=B4=90, =E1=B4=92, =E1=B4=85, =E1=B4=86=
, =E1=B4=87, =E2=82=91, =E2=82=94, =E1=B5=A9, =C9=A2, =CA=9B, =E1=B4=A6, =
=E1=B5=A7, =CA=9C, =E2=82=95, =C9=AA, =E1=B5=BB, =E1=B5=A2, =E1=B4=8A, =
=E2=B1=BC, =E1=B4=8B, =E2=82=96, =CA=9F, =E2=82=97, =E1=B4=8C, =E1=B4=A7, =
=E1=B4=8D, =E2=82=98, =EA=9F=BA, =C9=B4, =E1=B4=8E, =E2=82=99, =E1=B4=8F, =
=E2=82=92, =C9=B6, =CA=98, =E1=B4=93, =E1=B4=91, =E1=B4=98, =E2=82=9A, =
=E1=B4=A8, =E1=B4=AA, =CA=80, =E1=B5=A3, =E1=B4=99, =CA=81, =E1=B4=9A, =
=E1=B5=A8, =E2=82=9B, =E1=B4=9B, =E2=82=9C, =E1=B4=9C, =E1=B5=A4, =E1=B5=BE=
, =E1=B4=A0, =E1=B5=A5, =E1=B4=A1, =E2=82=93, =E1=B5=AA, =CA=8F, =E1=B4=A2=
, =E1=B4=A3 ]
[ =E4=BA=94, =E4=BC=8D, =E2=82=85, =E2=81=B5, =E2=85=A4, =E2=85=B4, =E2=91=
=A4, =E2=9E=84, =E2=9D=BA, =E2=9E=8E, =E2=93=B9, =E2=91=B8, =E2=92=8C, =
=EF=BC=95, =E3=8A=84, =E3=88=A4, =E3=90=85, =E3=A0=AA, =F0=A0=84=A1 ]
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Kai Ma <justksqsf@HIDDEN> Subject: bug#71454: Acknowledgement (30.0.50; Performance issues with font selection) Message-ID: <handler.71454.B.171796202311427.ack <at> debbugs.gnu.org> References: <D0616033-B8BD-4260-91A9-2C89347DC0BE@HIDDEN> X-Gnu-PR-Message: ack 71454 X-Gnu-PR-Package: emacs Reply-To: 71454 <at> debbugs.gnu.org Date: Sun, 09 Jun 2024 19:41:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 71454 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 71454: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D71454 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#71454: 30.0.50; Performance issues with font selection
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> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
>=20
> Would you be able to provide a self-contained series of steps starting
> from emacs -Q?
On my machine it is extremely easy to reproduce by simply:
1. emacs -Q
2. Switch to *scratch*
3. Copy the provided text into *scratch*
4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted =
by C-g
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Subject: bug#71454: 30.0.50; Performance issues with font selection
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Kai Ma <justksqsf@HIDDEN> writes:
>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
>>
>> Would you be able to provide a self-contained series of steps starting
>> from emacs -Q?
>
> On my machine it is extremely easy to reproduce by simply:
>
> 1. emacs -Q
> 2. Switch to *scratch*
> 3. Copy the provided text into *scratch*
> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
I am unable to reproduce this bug.
Please could you specify exactly which version of Emacs you are using?
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On 6/9/2024 3:17 PM, Kai Ma wrote:
>
>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
>>
>> Would you be able to provide a self-contained series of steps starting
>> from emacs -Q?
>
> On my machine it is extremely easy to reproduce by simply:
>
> 1. emacs -Q
> 2. Switch to *scratch*
> 3. Copy the provided text into *scratch*
> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
Is this on MS-Windows, by chance? Using a different set of steps, I can
reproduce this issue on MS-Windows (Emacs 29.3), but not on GNU/Linux.
Here's what I did:
emacs -Q
C-h v comint-password-prompt-regexp RET
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> On Jun 10, 2024, at 00:34, Jeremy Bryant <jb@HIDDEN> wrote:
>=20
> Kai Ma <justksqsf@HIDDEN> writes:
>=20
>>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> =
wrote:
>>>=20
>>> Would you be able to provide a self-contained series of steps =
starting
>>> from emacs -Q?
>>=20
>> On my machine it is extremely easy to reproduce by simply:
>>=20
>> 1. emacs -Q
>> 2. Switch to *scratch*
>> 3. Copy the provided text into *scratch*
>> 4. Emacs will freeze for 17 seconds or so, and it cannot be =
interrupted by C-g
>=20
> I am unable to reproduce this bug.
>=20
> Please could you specify exactly which version of Emacs you are using?
I=E2=80=99m using Emacs master branch (commit 7f8ded2a85d) on macOS.
X-Loop: help-debbugs@HIDDEN
Subject: bug#71454: 30.0.50; Performance issues with font selection
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> On Jun 10, 2024, at 01:10, Jim Porter <jporterbugs@HIDDEN> wrote:
>=20
> On 6/9/2024 3:17 PM, Kai Ma wrote:
>>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> =
wrote:
>>>=20
>>> Would you be able to provide a self-contained series of steps =
starting
>>> from emacs -Q?
>> On my machine it is extremely easy to reproduce by simply:
>> 1. emacs -Q
>> 2. Switch to *scratch*
>> 3. Copy the provided text into *scratch*
>> 4. Emacs will freeze for 17 seconds or so, and it cannot be =
interrupted by C-g
>=20
> Is this on MS-Windows, by chance? Using a different set of steps, I =
can reproduce this issue on MS-Windows (Emacs 29.3), but not on =
GNU/Linux. Here's what I did:
>=20
> emacs -Q
> C-h v comint-password-prompt-regexp RET
I=E2=80=99m using macOS. I apologize for not adding this info to my =
original report.
And yes, I can also reproduce the issue with C-h v =
comint-password-prompt-regexp RET=
X-Loop: help-debbugs@HIDDEN
Subject: bug#71454: 30.0.50; Performance issues with font selection
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> Cc: 71454 <at> debbugs.gnu.org
> From: Kai Ma <justksqsf@HIDDEN>
> Date: Mon, 10 Jun 2024 00:17:55 +0200
>
>
> > On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
> >
> > Would you be able to provide a self-contained series of steps starting
> > from emacs -Q?
>
> On my machine it is extremely easy to reproduce by simply:
>
> 1. emacs -Q
> 2. Switch to *scratch*
> 3. Copy the provided text into *scratch*
> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
I cannot reproduce this, I get an almost instantaneous redisplay with
those characters.
When your Emacs eventually displays the text, how many characters are
shown as boxes with hex code, and which ones are those?
X-Loop: help-debbugs@HIDDEN
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Date: Mon, 10 Jun 2024 14:53:36 +0300
Message-Id: <867cex9fpb.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <F814273E-4A20-46BC-88C9-37538C4DFAB9@HIDDEN> (message from
Kai Ma on Mon, 10 Jun 2024 04:18:08 +0200)
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severity 71454 wishlist
thanks
> Cc: Jeremy Bryant <jb@HIDDEN>, 71454 <at> debbugs.gnu.org
> From: Kai Ma <justksqsf@HIDDEN>
> Date: Mon, 10 Jun 2024 04:18:08 +0200
>
> > On Jun 10, 2024, at 01:10, Jim Porter <jporterbugs@HIDDEN> wrote:
> >
> > On 6/9/2024 3:17 PM, Kai Ma wrote:
> >>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
> >>>
> >>> Would you be able to provide a self-contained series of steps starting
> >>> from emacs -Q?
> >> On my machine it is extremely easy to reproduce by simply:
> >> 1. emacs -Q
> >> 2. Switch to *scratch*
> >> 3. Copy the provided text into *scratch*
> >> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
> >
> > Is this on MS-Windows, by chance? Using a different set of steps, I can reproduce this issue on MS-Windows (Emacs 29.3), but not on GNU/Linux. Here's what I did:
> >
> > emacs -Q
> > C-h v comint-password-prompt-regexp RET
>
>
> I’m using macOS. I apologize for not adding this info to my original report.
>
> And yes, I can also reproduce the issue with C-h v comint-password-prompt-regexp RET
AFAICT, the problematic part of comint-password-prompt-regexp is this:
गुप्तशब्द\\|शब्दकूट\\|গুপ্তশব্দ\\|পাসওয়ার্ড\\|ਪਾਸਵਰਡ\\|પાસવર્ડ\\|ପ୍ରବେଶ ସଙ୍କେତ\\|கடவுச்சொல்\\|సంకేతపదము\\|ಗುಪ್ತಪದ\\|അടയാളവാക്ക്\\|රහස්පදය
This has nothing to do with the number of fonts installed on the
system, nor with how Emacs searches for fonts, nor even with the fonts
themselves. On my system, all of the characters above are displayed
using the same single font. And yet, even if I insert just a single
character of those, which causes Emacs to find and load that font,
pasting the rest of the string takes several seconds in an unoptimized
build (I expect it to take about 2 sec or less in an optimized build).
Note that if you then paste the same string over and over again, the
display is instantaneous.
My crystal ball says that the expensive part here is character
composition. The above characters belong to scripts that require
extensive composition rules, take a look at indian.el and its complex
regexps. Displaying those characters requires the display code to
examine all those regexps, to find the largest composable sequence,
then generate the compositions by calling into Lisp, which then calls
back into C where we call HarfBuzz to produce the font glyphs for the
compositions. This is expensive, and so Emacs caches each composition
for further use, which explains why subsequent pastes are much faster.
IOW, this is a price we pay for the fact that we make character
compositions infinitely customizable on the Lisp level.
So far, I see no bug here. Of course, if someone wants to work on
redesign of how Emacs handles character composition, and as part of
such a redesign will make the process much faster, that would be very
welcome.
Received: (at control) by debbugs.gnu.org; 10 Jun 2024 11:58:30 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jun 10 07:58:30 2024 Received: from localhost ([127.0.0.1]:57394 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sGdfS-00085E-8X for submit <at> debbugs.gnu.org; Mon, 10 Jun 2024 07:58:30 -0400 Received: from eggs.gnu.org ([209.51.188.92]:42050) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1sGdfQ-00084R-66; Mon, 10 Jun 2024 07:58:28 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1sGdal-0007mk-5b; Mon, 10 Jun 2024 07:53:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=Z/yiZ3K0bc+FDCRR6iHb4MqKID+8oR1J1UUeVx9Hnx4=; b=liK2Gplensr0KLoCLz71 XEz45hKIyKsKbUdAsigrfH8oanwpQGXnVgX+0s4L2eKjht+FN8SEsG/xDyogO0viHbclT0k0foyKL FzDX27e+OEg+pra/Wu5+mGP1J6h0tlAyOOw6IoAW4F+qWMG9fbClY6ZvTuSCa1+0sr/sHO0+//AwI 27zIZ+uhxj/ZrEwK1iUYBqhFAUDLKv3RSnjhG/rjGhHsYhDnunXTFcnXGOUMZHtTzz7r1FxEaW26G w5tTodqj5TO8I3nMLy63LsbGsW/Xzo762CqWz8aA3b+CX1ebYLzO8Vt9DF6EpkIjk9JS6PkvteyyB ii9hvhrNnM6gTw==; Date: Mon, 10 Jun 2024 14:53:36 +0300 Message-Id: <867cex9fpb.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Kai Ma <justksqsf@HIDDEN> In-Reply-To: <F814273E-4A20-46BC-88C9-37538C4DFAB9@HIDDEN> (message from Kai Ma on Mon, 10 Jun 2024 04:18:08 +0200) Subject: Re: bug#71454: 30.0.50; Performance issues with font selection References: <D0616033-B8BD-4260-91A9-2C89347DC0BE@HIDDEN> <87v82h6a33.fsf@HIDDEN> <ABE7BD02-131A-4F53-979B-4D8B46C96B89@HIDDEN> <f4756916-dfe8-2c21-95f6-f3f2ee516d42@HIDDEN> <F814273E-4A20-46BC-88C9-37538C4DFAB9@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control Cc: jporterbugs@HIDDEN, jb@HIDDEN, 71454 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) severity 71454 wishlist thanks > Cc: Jeremy Bryant <jb@HIDDEN>, 71454 <at> debbugs.gnu.org > From: Kai Ma <justksqsf@HIDDEN> > Date: Mon, 10 Jun 2024 04:18:08 +0200 > > > On Jun 10, 2024, at 01:10, Jim Porter <jporterbugs@HIDDEN> wrote: > > > > On 6/9/2024 3:17 PM, Kai Ma wrote: > >>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote: > >>> > >>> Would you be able to provide a self-contained series of steps starting > >>> from emacs -Q? > >> On my machine it is extremely easy to reproduce by simply: > >> 1. emacs -Q > >> 2. Switch to *scratch* > >> 3. Copy the provided text into *scratch* > >> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g > > > > Is this on MS-Windows, by chance? Using a different set of steps, I can reproduce this issue on MS-Windows (Emacs 29.3), but not on GNU/Linux. Here's what I did: > > > > emacs -Q > > C-h v comint-password-prompt-regexp RET > > > I’m using macOS. I apologize for not adding this info to my original report. > > And yes, I can also reproduce the issue with C-h v comint-password-prompt-regexp RET AFAICT, the problematic part of comint-password-prompt-regexp is this: गुप्तशब्द\\|शब्दकूट\\|গুপ্তশব্দ\\|পাসওয়ার্ড\\|ਪਾਸਵਰਡ\\|પાસવર્ડ\\|ପ୍ରବେଶ ସଙ୍କେତ\\|கடவுச்சொல்\\|సంకేతపదము\\|ಗುಪ್ತಪದ\\|അടയാളവാക്ക്\\|රහස්පදය This has nothing to do with the number of fonts installed on the system, nor with how Emacs searches for fonts, nor even with the fonts themselves. On my system, all of the characters above are displayed using the same single font. And yet, even if I insert just a single character of those, which causes Emacs to find and load that font, pasting the rest of the string takes several seconds in an unoptimized build (I expect it to take about 2 sec or less in an optimized build). Note that if you then paste the same string over and over again, the display is instantaneous. My crystal ball says that the expensive part here is character composition. The above characters belong to scripts that require extensive composition rules, take a look at indian.el and its complex regexps. Displaying those characters requires the display code to examine all those regexps, to find the largest composable sequence, then generate the compositions by calling into Lisp, which then calls back into C where we call HarfBuzz to produce the font glyphs for the compositions. This is expensive, and so Emacs caches each composition for further use, which explains why subsequent pastes are much faster. IOW, this is a price we pay for the fact that we make character compositions infinitely customizable on the Lisp level. So far, I see no bug here. Of course, if someone wants to work on redesign of how Emacs handles character composition, and as part of such a redesign will make the process much faster, that would be very welcome.
X-Loop: help-debbugs@HIDDEN
Subject: bug#71454: 30.0.50; Performance issues with font selection
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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Kai Ma <justksqsf@HIDDEN>
> Date: Sun, 9 Jun 2024 20:56:47 +0200
>
> I have currently (length (font-family-list)) = 582 font families
> installed. And whenever I input some ununsual characters, Emacs will
> freeze for seconds until I am able to do anything else. Worse, the
> freeze delay for each character will add up. And whenver the face
> changes (including hl-line-mode), or I switched to another buffer for
> some time, there will be a delay again.
FTR, I have 553 font families, and I see no significant delay when
pasting the characters you show.
> I'm pretty sure this is due to font selection, because Emacs won't
> freeze if I configure manually the fallback fonts for each 'exotic'
> script I encounter.
If this is the case, please tell the details: which fonts you need to
configure manually to eliminate the delay.
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> On Jun 10, 2024, at 13:58, Eli Zaretskii <eliz@HIDDEN> wrote:
>=20
>> From: Kai Ma <justksqsf@HIDDEN>
>> Date: Sun, 9 Jun 2024 20:56:47 +0200
>>=20
>> I have currently (length (font-family-list)) =3D 582 font families
>> installed. And whenever I input some ununsual characters, Emacs will
>> freeze for seconds until I am able to do anything else. Worse, the
>> freeze delay for each character will add up. And whenver the face
>> changes (including hl-line-mode), or I switched to another buffer for
>> some time, there will be a delay again.
>=20
> FTR, I have 553 font families, and I see no significant delay when
> pasting the characters you show.
>=20
>> I'm pretty sure this is due to font selection, because Emacs won't
>> freeze if I configure manually the fallback fonts for each 'exotic'
>> script I encounter.
>=20
> If this is the case, please tell the details: which fonts you need to
> configure manually to eliminate the delay.
I currently use the following config:
(set-fontset-font t 'han "PingFang TC")
(set-fontset-font t 'kana "PingFang TC")
(set-fontset-font t 'kanbun "PingFang TC")
(set-fontset-font t 'hangul "PingFang TC")
(set-fontset-font t 'cjk-misc "PingFang TC")
(set-fontset-font t 'unicode "PingFang TC" nil 'append)
(set-fontset-font t 'unicode (font-spec :family "Apple Color Emoji") nil =
'prepend)
(dolist (thfont '("TH-Feon" "TH-Sy-P0" "TH-Sy-P2" "TH-Sy-P16" =
"TH-Tshyn-P0"))
(set-fontset-font t 'unicode thfont nil 'append))
PingFang TC and Apple Color Emoji are built into macOS, and TH-* fonts =
are from the Internet to cover a majority of the Unicode code points.
For example, =E3=80=A1=E3=80=A2=E3=80=A3=E3=80=A4=E3=80=A5=E3=80=A6=E3=80=A8=
=E3=80=A9=E3=80=B8=E3=80=B9=E3=80=BA belongs to cjk-misc script, and I =
have to specify a font for it to avoid delays.
--Apple-Mail=_9CBA96E5-C9CE-4A82-9857-D001026F06EB
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
charset=utf-8
<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;"><br =
id=3D"lineBreakAtBeginningOfMessage"><div><br><blockquote =
type=3D"cite"><div>On Jun 10, 2024, at 13:58, Eli Zaretskii =
<eliz@HIDDEN> wrote:</div><br =
class=3D"Apple-interchange-newline"><div><div><blockquote =
type=3D"cite">From: Kai Ma <justksqsf@HIDDEN><br>Date: Sun, 9 =
Jun 2024 20:56:47 +0200<br><br>I have currently (length =
(font-family-list)) =3D 582 font families<br>installed. And whenever I =
input some ununsual characters, Emacs will<br>freeze for seconds until I =
am able to do anything else. Worse, the<br>freeze delay for each =
character will add up. And whenver the face<br>changes (including =
hl-line-mode), or I switched to another buffer for<br>some time, there =
will be a delay again.<br></blockquote><br>FTR, I have 553 font =
families, and I see no significant delay when<br>pasting the characters =
you show.<br><br><blockquote type=3D"cite">I'm pretty sure this is due =
to font selection, because Emacs won't<br>freeze if I configure manually =
the fallback fonts for each 'exotic'<br>script I =
encounter.<br></blockquote><br>If this is the case, please tell the =
details: which fonts you need to<br>configure manually to eliminate the =
delay.<br></div></div></blockquote></div><div><br></div><div>I currently =
use the following config:</div><br><div><div>(set-fontset-font t 'han =
"PingFang TC")</div><div>(set-fontset-font t 'kana "PingFang =
TC")</div><div>(set-fontset-font t 'kanbun "PingFang =
TC")</div><div>(set-fontset-font t 'hangul "PingFang =
TC")</div><div>(set-fontset-font t 'cjk-misc "PingFang =
TC")</div><div>(set-fontset-font t 'unicode "PingFang TC" nil =
'append)</div><div>(set-fontset-font t 'unicode (font-spec :family =
"Apple Color Emoji") nil 'prepend)</div><div>(dolist (thfont '("TH-Feon" =
"TH-Sy-P0" "TH-Sy-P2" "TH-Sy-P16" "TH-Tshyn-P0"))</div><div> =
(set-fontset-font t 'unicode thfont nil =
'append))</div></div><div><br></div><div>PingFang TC and Apple Color =
Emoji are built into macOS, and TH-* fonts are from the Internet to =
cover a majority of the Unicode code =
points.</div><div><br></div><div>For example, <span =
style=3D"font-family: Menlo-Regular;">=E3=80=A1=E3=80=A2=E3=80=A3=E3=80=A4=
=E3=80=A5=E3=80=A6=E3=80=A8=E3=80=A9=E3=80=B8=E3=80=B9=E3=80=BA belongs =
to cjk-misc script, and I have to specify a font for it to avoid =
delays.</span></div><div><br></div></body></html>=
--Apple-Mail=_9CBA96E5-C9CE-4A82-9857-D001026F06EB--
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Content preview: > On Jun 10, 2024, at 13:55, Eli Zaretskii wrote: > >> Cc:
71454 <at> debbugs.gnu.org >> From: Kai Ma >> Date: Mon, 10 Jun 2024 00:17:55
+0200 >> >> >>> On Jun 10, 2024, at 00:10, Jeremy Bryant wrote [...]
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> On Jun 10, 2024, at 13:55, Eli Zaretskii <eliz@HIDDEN> wrote:
>=20
>> Cc: 71454 <at> debbugs.gnu.org
>> From: Kai Ma <justksqsf@HIDDEN>
>> Date: Mon, 10 Jun 2024 00:17:55 +0200
>>=20
>>=20
>>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> =
wrote:
>>>=20
>>> Would you be able to provide a self-contained series of steps =
starting
>>> from emacs -Q?
>>=20
>> On my machine it is extremely easy to reproduce by simply:
>>=20
>> 1. emacs -Q
>> 2. Switch to *scratch*
>> 3. Copy the provided text into *scratch*
>> 4. Emacs will freeze for 17 seconds or so, and it cannot be =
interrupted by C-g
>=20
> I cannot reproduce this, I get an almost instantaneous redisplay with
> those characters.
>=20
> When your Emacs eventually displays the text, how many characters are
> shown as boxes with hex code, and which ones are those?
None are hex code here. They eventually get displayed, but it takes a =
long time.
X-Loop: help-debbugs@HIDDEN
Subject: bug#71454: 30.0.50; Performance issues with font selection
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> Cc: 71454 <at> debbugs.gnu.org
> From: Kai Ma <justksqsf@HIDDEN>
> Date: Mon, 10 Jun 2024 04:14:40 +0200
>
>
>
> > On Jun 10, 2024, at 00:34, Jeremy Bryant <jb@HIDDEN> wrote:
> >
> > Kai Ma <justksqsf@HIDDEN> writes:
> >
> >>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
> >>>
> >>> Would you be able to provide a self-contained series of steps starting
> >>> from emacs -Q?
> >>
> >> On my machine it is extremely easy to reproduce by simply:
> >>
> >> 1. emacs -Q
> >> 2. Switch to *scratch*
> >> 3. Copy the provided text into *scratch*
> >> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
> >
> > I am unable to reproduce this bug.
> >
> > Please could you specify exactly which version of Emacs you are using?
>
> I’m using Emacs master branch (commit 7f8ded2a85d) on macOS.
Maybe this is specific to the macOS font back-end, which AFAIU is a
special one used only on macOS.
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Date: Mon, 10 Jun 2024 16:03:41 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <B7AE53E3-194C-4E87-AC9D-9707740973A1@HIDDEN> (message from
Kai Ma on Mon, 10 Jun 2024 14:34:42 +0200)
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> From: Kai Ma <justksqsf@HIDDEN>
> Date: Mon, 10 Jun 2024 14:34:42 +0200
> Cc: 71454 <at> debbugs.gnu.org
>
> I currently use the following config:
>
> (set-fontset-font t 'han "PingFang TC")
> (set-fontset-font t 'kana "PingFang TC")
> (set-fontset-font t 'kanbun "PingFang TC")
> (set-fontset-font t 'hangul "PingFang TC")
> (set-fontset-font t 'cjk-misc "PingFang TC")
> (set-fontset-font t 'unicode "PingFang TC" nil 'append)
> (set-fontset-font t 'unicode (font-spec :family "Apple Color Emoji") nil 'prepend)
> (dolist (thfont '("TH-Feon" "TH-Sy-P0" "TH-Sy-P2" "TH-Sy-P16" "TH-Tshyn-P0"))
> (set-fontset-font t 'unicode thfont nil 'append))
>
> PingFang TC and Apple Color Emoji are built into macOS, and TH-* fonts are from the Internet to cover a
> majority of the Unicode code points.
>
> For example, 〡〢〣〤〥〦〨〩〸〹〺 belongs to cjk-misc script, and I have to specify a font for it to avoid
> delays.
FWIW, I get instantaneous display when I copy/paste that text into an
"emacs -Q" I just started, even though I have no fonts for the last 3
characters (which means Emacs searches all the fonts installed on the
system).
X-Loop: help-debbugs@HIDDEN
Subject: bug#71454: 30.0.50; Performance issues with font selection
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(code B ref 71454); Mon, 10 Jun 2024 15:13:04 +0000
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Date: Mon, 10 Jun 2024 15:59:52 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <4F59591A-23F6-4DB2-A350-52ED24408F39@HIDDEN> (message from
Kai Ma on Mon, 10 Jun 2024 14:35:50 +0200)
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> From: Kai Ma <justksqsf@HIDDEN>
> Date: Mon, 10 Jun 2024 14:35:50 +0200
> Cc: Jeremy Bryant <jb@HIDDEN>,
> 71454 <at> debbugs.gnu.org
>
>
>
> > On Jun 10, 2024, at 13:55, Eli Zaretskii <eliz@HIDDEN> wrote:
> >
> >> Cc: 71454 <at> debbugs.gnu.org
> >> From: Kai Ma <justksqsf@HIDDEN>
> >> Date: Mon, 10 Jun 2024 00:17:55 +0200
> >>
> >>
> >>> On Jun 10, 2024, at 00:10, Jeremy Bryant <jb@HIDDEN> wrote:
> >>>
> >>> Would you be able to provide a self-contained series of steps starting
> >>> from emacs -Q?
> >>
> >> On my machine it is extremely easy to reproduce by simply:
> >>
> >> 1. emacs -Q
> >> 2. Switch to *scratch*
> >> 3. Copy the provided text into *scratch*
> >> 4. Emacs will freeze for 17 seconds or so, and it cannot be interrupted by C-g
> >
> > I cannot reproduce this, I get an almost instantaneous redisplay with
> > those characters.
> >
> > When your Emacs eventually displays the text, how many characters are
> > shown as boxes with hex code, and which ones are those?
>
> None are hex code here. They eventually get displayed, but it takes a long time.
Then it definitely sounds like macOS specific. Does anyone know how
Emacs on macOS searches for fonts, and whether there are any
font-caching facilities, either in Emacs or by the OS?
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