[Okular-devel] [okular] [Bug 359932] New: Okular is very slow at opening some EPUB's

[Guillaume Maudoux via KDE Bugzilla (layus)]

https://bugs.kde.org/show_bug.cgi?id=359932

            Bug ID: 359932
           Summary: Okular is very slow at opening some EPUB's
           Product: okular
           Version: 0.24.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: EPub backend
          Assignee: okular-devel at kde.org
          Reporter: layus.on at gmail.com

Some epubs take forever before opening (rendering the first page).
Everything looks like Okular freezes while loading the epub, then the rendering
is laggy (not fast, but not freezing either).


Reproducible: Always

Steps to Reproduce:
1. Download the epub @ http://www.spacians.net/files/spacians.epub
2. Open it with okular and wait >20s for the first rendering.

Actual Results:  
Freezes for >20s before opening.

Expected Results:  
Freeze less :-)


Callgrind indicates that 66% of that time is spent in libfreetype, 20% in
libQtCore and 8% in libQtGUI
The complete callgrind dump is available at
https://transvol.sgsi.ucl.ac.be/download.php?id=7020990a32c9daaf (14 days...)

This is a possible duplicate of #358562, but that bug contains nearly no
information, so its har to say if this is related.

The issue was first reported on NixOS
(https://github.com/NixOS/nixpkgs/issues/9644) but I then tried it on
ArchLinux. Guys on NixOS also reported the issue to happen on Fedora.

---
Okular 
Version 0.24.2
Using KDE Development Platform 4.14.17

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