https://bugs.kde.org/show_bug.cgi?id=471792
Bug ID: 471792
Summary: Annotations greatly increase PDF file size and
massively slow down Okular
Classification: Applications
Product: okular
Version: 22.12.3
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: okular-de...@kde.org
Reporter: k...@jmbreuer.net
Target Milestone: ---
SUMMARY
Adding annotations to a run-of-the-mill PDF file (out of pdfLaTeX, I presume)
hugely increases the file size with each additional annotation.
STEPS TO REPRODUCE
1. Open a PDF file
2. Add a couple of annotations (I mostly used Inline Notes, but also some
underlines and Pop-up Notes)
3. Save as PDF
OBSERVED RESULT
Saving my 6.4 MB sample PDF with very few test annotations and saving as PDF
yields a 7.4 MB file.
Removing those and adding a couple of 'real' annotations, the saved PDF weighs
in at 20.7 MB.
Changing font size of two Inline Note annotations after they have been created
yields a huge PDF of 143.4 MB.
With the increase in file size also comes an increase in CPU usage to the point
that Okular slows down and becomes practically unusable (especially /
immediately noticable with the "resized font" case).
EXPECTED RESULT
Annotations should only slightly increase file size and not strongly affect
interactive performance.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: gentoo Linux 2.13, Kernel 6.1.31-gentoo (64-bit)
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
ADDITIONAL INFORMATION
Since attachments cannot exceed 4000kB, and all my samples are larger than
that, I've put together my sample files here:
https://github.com/jmbreuer/heap/tree/main/kde-okular-bug-20230630
I've also seen bug #470128, and also noticed that changing the font size of an
Inline Note annotation after adding it would hugely increase the file size
(changing two notes, from those 6.4/7.4 MB to 143.4 MB).
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