[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

Peter Nowee  changed:

   What|Removed |Added

 Status|RESOLVED|NEW
 Resolution|WORKSFORME  |---

--- Comment #21 from Peter Nowee  ---
Sorry for the late reply, but I am definitively still seeing this bug.

To reproduce:
1. Tools -> Options -> LibreOffice Writer -> Basic Fonts (Asian)
   Set the Default (top row) to a Western font, for example 
   Liberation Serif or DejaVu Sans.
   (Alternatively, set it to an Asian font, close LibreOffice and
   uninstall that Asian font from your computer.)
2. Open attachment 102679 with Writer;
3. In the middle of the first page, try to delete some chars using
   the BACKSPACE, or try to type in some text. Slow to Very slow.
4. Search for "字" and enable "Find All". Very slow, even unresponsive
   for a while.

To show that the (fallback) font is the problem:
5.a. Change the font of the text to an Asian font, for example
 Noto Sans CJK SC or AR PL UKai TW.
or:
5.b. Tools -> Options -> LibreOffice Writer -> Basic Fonts (Asian)
 Set the Default (top row) to an Asian font, for example
 Noto Sans CJK SC or AR PL UKai TW.

Now steps 3 and 4 become normal speed (fast) again.

Version: 7.4.1.2 / LibreOffice Community
Build ID: 40(Build:2)
CPU threads: 2; OS: Linux 5.10; UI render: default; VCL: x11
Locale: en-US (en_US.UTF-8); UI: en-US
Debian package version: 1:7.4.1-1~bpo11+2
Calc: threaded

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

Kevin Suo  changed:

   What|Removed |Added

 Resolution|--- |WORKSFORME
 Status|NEEDINFO|RESOLVED

--- Comment #20 from Kevin Suo  ---
WORKSFORME in
Version: 7.4.0.0.alpha0+ / LibreOffice Community
Build ID: 02e1be8883a08ab17f3e890a834ab88f13c5867d
CPU threads: 8; OS: Linux 5.16; UI render: default; VCL: gtk3
Locale: zh-CN (zh_CN.UTF-8); UI: zh-CN
Build Platform: Fedora34@X64, Branch:master, bibisect-linux-64-7.4-CN
Calc: threaded

Close as RESOLVED WORKSFORME.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

--- Comment #19 from Philipp Weissenbacher  ---
I retested the attachment "A Very Slow Chinese Document" in

Version: 7.3.0.3 / LibreOffice Community
Build ID: 0f246aa12d0eee4a0f7adcefbf7c878fc2238db3
CPU threads: 8; OS: Mac OS X 12.2.1; UI render: Skia/Metal; VCL: osx
Locale: en-US (en_NL.UTF-8); UI: en-US
Calc: threaded

on a

Mac mini (M1, 2020), 16GB of RAM, on macOS 12.2.1

- Deleting, adding, scrolling and searching for characters is as fast as can be
expected

- If I search for "字" and enable "Find All", it takes roughly 3 seconds for the
results to appear.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

Roman Kuznetsov <79045_79...@mail.ru> changed:

   What|Removed |Added

 CC||79045_79...@mail.ru
 Status|NEW |NEEDINFO

--- Comment #18 from Roman Kuznetsov <79045_79...@mail.ru> ---
I don't see the problem in

Version: 7.3.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: a9cc066a86c6bd3423c5802c5a4eded55a50c754
CPU threads: 4; OS: Windows 6.1 Service Pack 1 Build 7601; UI render:
Skia/Raster; VCL: win
Locale: ru-RU (ru_RU); UI: en-US
Calc: threaded

Alex, Kevin, could you please retest it on your machines?

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

--- Comment #17 from Kevin Suo  ---
Created attachment 157238
  --> https://bugs.documentfoundation.org/attachment.cgi?id=157238=edit
perf flamegraph svg

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

--- Comment #16 from Alex Thurgood  ---
Still reproducible with

Version: 6.2.0.0.alpha1+
Build ID: 740b99783b5480fcd1e5fce7c1beb5967d015041
CPU threads: 4; OS: Mac OS X 10.14.1; UI render: default; VCL: osx; 
Locale: fr-FR (fr_FR.UTF-8); Calc: threaded

Just deleting characters from the text document on MacOS Mojave using the
backspace key is terribly slow.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters ( because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

Aron Budea  changed:

   What|Removed |Added

   Keywords||perf

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters ( because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

--- Comment #15 from QA Administrators  ---
** Please read this message in its entirety before responding **

To make sure we're focusing on the bugs that affect our users today,
LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed
bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this
bug report. During that time, it's possible that the bug has been fixed, or the
details of the problem have changed. We'd really appreciate your help in
getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present on a currently supported version of
LibreOffice 
(5.1.6 or 5.2.3  https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the version of
LibreOffice and 
your operating system, and any changes you see in the bug behavior

If the bug is NOT present, please set the bug's Status field to
RESOLVED-WORKSFORME and leave 
a short comment that includes your version of LibreOffice and Operating System

Please DO NOT

Update the version field
Reply via email (please reply directly on the bug tracker)
Set the bug's Status field to RESOLVED - FIXED (this status has a particular
meaning that is not 
appropriate in this case)


If you want to do more to help you can test to see if your issue is a
REGRESSION. To do so:
1. Download and install oldest version of LibreOffice (usually 3.3 unless your
bug pertains to a feature added after 3.3)

http://downloadarchive.documentfoundation.org/libreoffice/old/

2. Test your bug
3. Leave a comment with your results.
4a. If the bug was present with 3.3 - set version to "inherited from OOo";
4b. If the bug was not present in 3.3 - add "regression" to keyword


Feel free to come ask questions or to say hello in our QA chat:
http://webchat.freenode.net/?channels=libreoffice-qa

Thank you for helping us make LibreOffice even better for everyone!

Warm Regards,
QA Team

MassPing-UntouchedBug-20170103

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

--- Comment #14 from bresson-matth...@orange.fr ---
(In reply to Matthew Francis from comment #12)

I confirm that I am affected by this bug too, in this version and following the
same steps as Kevin Suo:
Version: 4.4.7.2
Build ID: 4.4.7.2-1.fc22
Locale: en_US.UTF-8
Fedora 22 x64

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=81272

Michael Stahl mst...@redhat.com changed:

   What|Removed |Added

 Attachment #102677|text/plain  |application/vnd.oasis.opend
  mime type||ocument.text

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #13 from Kevin Suo suokunl...@126.com ---
(In reply to Matthew Francis from comment #12)
I confirm that this bug still exists in the following version:
Version: 4.4.0.2
Build ID: a3603970151a6ae2596acd62b70112f4d376b990
Locale: zh_CN
Fedora 22 X64.

Steps to reproduce:
1. Open attachment 102679 with Writer;
2. Try to delete some chars using the BACKSPACE, or try to type in some text.
-- Very slow.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Commit Notification libreoffice-comm...@lists.freedesktop.org changed:

   What|Removed |Added

 Whiteboard||target:4.4.0

--- Comment #8 from Commit Notification 
libreoffice-comm...@lists.freedesktop.org ---
Matthew J. Francis committed a patch related to this issue.
It has been pushed to master:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=a34a8fca21c670c4e7ee147d05ed9e6e4136cbe1

fdo#81272 Speed up break iterators



The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
http://wiki.documentfoundation.org/Testing_Daily_Builds
Affected users are encouraged to test the fix and report feedback.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #9 from Commit Notification 
libreoffice-comm...@lists.freedesktop.org ---
Caolan McNamara committed a patch related to this issue.
It has been pushed to master:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=997d1387abcfa40eca8d15a2fe025edc4a1de040

Revert fdo#81272 Speed up break iterators



The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
http://wiki.documentfoundation.org/Testing_Daily_Builds
Affected users are encouraged to test the fix and report feedback.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #10 from Commit Notification 
libreoffice-comm...@lists.freedesktop.org ---
Matthew J. Francis committed a patch related to this issue.
It has been pushed to master:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=44ead04eb5fc61a3f56f783adb1509fab440e212

fdo#81272 Speed up break iterators



The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
http://wiki.documentfoundation.org/Testing_Daily_Builds
Affected users are encouraged to test the fix and report feedback.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #11 from Caolán McNamara caol...@redhat.com ---
caolanm-fdbugs: Can we call this fixed now ?

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #12 from Matthew Francis fdb...@neosheffield.co.uk ---
Two concerns with closing at this point:

1) The reporter had a slightly different symptom to the problem that's just
been patched - that the slowdown was dependent on fonts. I never reproduced
that on OSX; the reported issue may not be identical.

2) After the patch, performance with CJK text is much better in the 10,000
character range, but still poor with a few times that (30k or above is still
appreciably slow on my local machine). This compares poorly with a paragraph of
the same number of western text characters.


I have a few ideas on possibilities for further improving performance, but not
much that's as simple as the first patch...

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #6 from Matthew Francis fdb...@neosheffield.co.uk ---
Poked at this a little with callgrind. There appear to be a number of villains
in this case:

1) SwTxtFrm::CollectAutoCmplWrds
Called from beneath SwLayIdle::DoIdleJob()
Workaround: Disable Tools – Autocorrect Options... – Word Completion – Collect
words

2) SwTxtFrm::_AutoSpell
Called from beneath SwLayIdle::DoIdleJob()
Workaround: Disable Tools – Automatic Spell Checking

3) SwTxtNode::CountWords
Called from beneath SwLayIdle::DoIdleJob()
Workaround: None found

4) SwTxtNode::CountWords
Called from beneath DocumentStatisticsManager::IncrementalDocStatCalculate
Workaround: None found


Each of these spends a long time dissecting text using SwScanner. In addition,
(3) and (4) appear to be counting the same words twice, which compounds the
fact that it's a slow operation on a long paragraph.

With all four disabled (commenting code out where necessary), editing the giant
paragraph in the text document is merely slow rather than intolerable.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #7 from Matthew Francis fdb...@neosheffield.co.uk ---
For a paragraph with N continuous characters of Chinese text (e.g. N x 中),
iterating over the paragraph with SwScanner will cause
xdictionary::getWordBoundary() to be called N times, each of which will call
xdictionary::seekSegment(), which will in turn iterate over each of the N
characters

- N^2 operations

This needs refactoring so seekSegment() doesn't keep doing the same work over
and over again



For Chinese text, the path through from SwScanner to xdictionary goes like
this:

frame #1: 0x000110919243
libi18npoollo.dylib`com::sun::star::i18n::xdictionary::seekSegment(this=0x00010c08a000,
rText=0x7fff5fbfa930, pos=1, segBoundary=0x00010c08a028) + 115 at
xdictionary.cxx:280
frame #2: 0x0001109199dd
libi18npoollo.dylib`com::sun::star::i18n::xdictionary::getWordBoundary(this=0x00010c08a000,
rText=0x7fff5fbfa930, anyPos=1, wordType=3, bDirection=true) + 173 at
xdictionary.cxx:412
frame #3: 0x0001109073e7
libi18npoollo.dylib`com::sun::star::i18n::BreakIterator_CJK::getWordBoundary(this=0x00011ff93ab8,
text=0x7fff5fbfa930, anyPos=1, nLocale=0x0001206d7600, wordType=3,
bDirection='\x01') + 119 at breakiterator_cjk.cxx:81
frame #4: 0x00011090753c libi18npoollo.dylib`non-virtual thunk to
com::sun::star::i18n::BreakIterator_CJK::getWordBoundary(this=0x00011ff93ae0,
text=0x7fff5fbfa930, anyPos=1, nLocale=0x0001206d7600, wordType=3,
bDirection='\x01') + 92 at breakiterator_cjk.cxx:88
frame #5: 0x00011090e0e4
libi18npoollo.dylib`com::sun::star::i18n::BreakIteratorImpl::getWordBoundary(this=0x000117072b78,
Text=0x7fff5fbfa930, nPos=1, rLocale=0x0001206d7600, rWordType=3,
bDirection='\x01') + 612 at breakiteratorImpl.cxx:182
frame #6: 0x00011090e1dc libi18npoollo.dylib`non-virtual thunk to
com::sun::star::i18n::BreakIteratorImpl::getWordBoundary(this=0x000117072ba0,
Text=0x7fff5fbfa930, nPos=1, rLocale=0x0001206d7600, rWordType=3,
bDirection='\x01') + 92 at breakiteratorImpl.cxx:186
frame #7: 0x0001184e85d0
libswlo.dylib`SwScanner::NextWord(this=0x7fff5fbfa918) + 1296 at
txtedt.cxx:836

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Matthew Francis fdb...@neosheffield.co.uk changed:

   What|Removed |Added

 Blocks||83066

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Matthew Francis fdb...@neosheffield.co.uk changed:

   What|Removed |Added

 CC||fdb...@neosheffield.co.uk

--- Comment #5 from Matthew Francis fdb...@neosheffield.co.uk ---
OSX 10.9.4 / LO 4.3.0.4, 4.4 master:

The slow document seems sluggish to me whether or not the text is set
explicitly to a Chinese font

If anything it also seems rather slower on 4.4 master than in 4.3.0.4 release

If I open the document and type some as, it is initially slow but responsive
as long as I keep typing. However, after stopping, the next letter typed is
only processed after a long pause.

I wondered based on this if spellchecking might be involved, but setting the
language of the text to None doesn't seem to make any difference - unless
there is some processing that isn't disabled when this is done

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Kevin Suo suokunl...@gmail.com changed:

   What|Removed |Added

   See Also||https://bugs.freedesktop.or
   ||g/show_bug.cgi?id=80788

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

--- Comment #4 from carldon...@gmail.com ---
I confirmed that if I set font explicitly, it becomes fast.

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Kevin Suo suokunl...@gmail.com changed:

   What|Removed |Added

Summary|Libreoffice Is Very Slow|Libreoffice Is Very Slow
   |Rendering Chinese   |Rendering Chinese
   |Characters  |Characters (because of font
   ||fallback?)

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[Libreoffice-bugs] [Bug 81272] Libreoffice Is Very Slow Rendering Chinese Characters (because of font fallback?)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=81272

Kevin Suo suokunl...@gmail.com changed:

   What|Removed |Added

   Severity|normal  |major

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