[Libreoffice-bugs] [Bug 140443] New: FILEOPEN DOCX Opening file with many tracked changes is slow

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=140443

            Bug ID: 140443
           Summary: FILEOPEN DOCX Opening file with many tracked changes
                    is slow
           Product: LibreOffice
           Version: 6.0.0.3 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: filter:docx, perf
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: libreoffice at nisz.hu
                CC: nemeth at numbertext.org
            Blocks: 115709

Created attachment 169779
  --> https://bugs.documentfoundation.org/attachment.cgi?id=169779&action=edit
Example file from Word with many tracked changes

Attached file was made in Word by inserting 100 paragraphs of lorem ipsum, then
replacing each letter (some 10k in total) while change tracking was enabled.
Word opens this file in about 5 seconds on my machine while Writer takes about
25 when measured with:

$ time OOO_EXIT_POST_STARTUP=1 instdir/program/soffice ../CT-10k-letters.docx

real    0m23.534s
user    0m0.202s
sys     0m0.093s

(Note: my antivirus may or may not contribute to this value).

Steps to reproduce:
    1. Open attached file

Actual results:
Opening takes about half a minute, even with warm caches.

Expected results:
Opening could take less time.

LibreOffice details:
Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 380ab85b6594a013f34f5e6ec69fb569336bbb48
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: default; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: threaded

I measured similar values in 7.0 and 6.0 while 5.0 was in the 40-45 seconds
range – this is not a regression. But there may be room for improvement still.


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=115709
[Bug 115709] [META] DOCX (OOXML) Tracking changes-related issues
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