https://bugs.kde.org/show_bug.cgi?id=474299
Bug ID: 474299
Summary: Typing long text in PDF forms extremely slow
Classification: Applications
Product: okular
Version: 23.04.3
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: okular-de...@kde.org
Reporter: m_loui...@yahoo.com
Target Milestone: ---
Created attachment 161510
--> https://bugs.kde.org/attachment.cgi?id=161510&action=edit
Profile
SUMMARY
When editing a (specific) PDF form with a "free text" field, typing is
extremely slow with okular at 100% CPU usage (multiple seconds per character).
A quick profile shows Poppler::FormFieldText::setText(QString) as the main
culprit, apparently reloading fonts and querying FontConfig in the process.
Okular shouldn't call this function on every edit (and I suspect even for every
letter in the text, else it wouldn't be so slow).
STEPS TO REPRODUCE
1. Open a PDF form with a multiline text field (I can test patches/share mine
privately if needed)
2. Try to type some text
OBSERVED RESULT
Wait for 5 seconds per letter you type
EXPECTED RESULT
Editing test is instant
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.10
Kernel Version: 6.2.0-31-generic (64-bit)
Graphics Platform: Wayland
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