[Libreoffice-bugs] [Bug 146319] New: [SVG] load/export of W3C SVG example car.svg is slow

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=146319

            Bug ID: 146319
           Summary: [SVG] load/export of W3C SVG example car.svg is slow
           Product: LibreOffice
           Version: 7.2.4.1 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: hoss...@libreoffice.org

Description:
Loading the W3C SVG example car.svg is slow in LibreOffice, and the export to
PDF is also slow. Each of these take ~10 seconds. The same file is loaded
immediately in Firefox and Chrome. On debug builds of LibreOffice, it is ~1
minute.

Steps to Reproduce:
1. Download this example from w3.org website:
https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/car.svg
2. Open it in LibreOffice using "Open File"
3. Export it to PDF

Actual Results:
The loading is slow, and the interface becomes non-responsive for some seconds.
In the official release build, it takes ~10 seconds to become responsive again.
Export to PDF also takes ~10 seconds. On debug builds of LibreOffice, it is ~1
minute.

Expected Results:
The file should be loaded immediately (<1s) and the UI should be responsive.


Reproducible: Always


User Profile Reset: No



Additional Info:
Tested with LibreOffice 7.2:

Version: 7.2.4.1 / LibreOffice Community
Build ID: 27d75539669ac387bb498e35313b970b7fe9c4f9
CPU threads: 8; OS: Linux 5.11; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Calc: threaded

Converting to PDF using LibreOffice is 10 times slower compared to Chrome.

$ time libreoffice7.2 --headless --convert-to pdf car.svg 
convert /out/car.svg -> /out/car.pdf using filter : draw_pdf_Export
Overwriting: /out/car.pdf

real    0m7.889s
user    0m5.882s
sys     0m0.460s


$ time google-chrome --headless --disable-gpu --print-to-pdf car.svg
[1219/203135.191113:INFO:headless_shell.cc(653)] Written to file output.pdf.

real    0m0.703s
user    0m0.139s
sys     0m0.058s

Debug build of the latest LibreOffice 7.4 master:

$ time ./instdir/program/soffice --headless --convert-to pdf car.svg 
...
convert /out/car.svg -> /out/car.pdf using filter : draw_pdf_Export
...

real    1m2.630s
user    1m0.568s
sys     0m0.781s

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