https://bugs.kde.org/show_bug.cgi?id=513373
Bug ID: 513373
Summary: Very slow to render PDF (>1 minute versus 7 seconds
elsewhere)
Classification: Applications
Product: okular
Version First 25.12.0
Reported In:
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
STEPS TO REPRODUCE
1. Download
https://methowtrails.org/assets/wintertrails_winthroptobrownsfarm_2026.pdf (I
am not attaching it to this ticket because it's larger than the bug platform
upload limit)
2. Open this PDF in Okular
OBSERVED RESULT
It takes about 1 minute 3 seconds on my machine to render this PDF.
When I open the same PDF (from the local filesystem) in Firefox, it takes 7
seconds.
When I open the same PDF on my iPhone 12 Pro, it likewise takes less than 10
seconds.
EXPECTED RESULT
Okular should take about as long as Firefox does to render the PDF.
SOFTWARE/OS VERSIONS
Operating System: NixOS 26.05
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.18.0 (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor: Intel® Arc
RELATED ISSUES
Very slow render time on restaurant menu
https://bugs.kde.org/show_bug.cgi?id=464716
The app inmediatelly crashes when trying to open a long pdf
https://bugs.kde.org/show_bug.cgi?id=494388
PDF Rendering issues: Takes many seconds to render new page and renderings are
not cleared on zooming
https://bugs.kde.org/show_bug.cgi?id=469886
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