[okular] [Bug 419075] New: okular is very slow with pdf files

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=419075

            Bug ID: 419075
           Summary: okular is very slow with pdf files
           Product: okular
           Version: 1.9.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: humufr at yahoo.fr
  Target Milestone: ---

SUMMARY


STEPS TO REPRODUCE
1. open a 'large' pdf with images (it is easier to see it) like that one: 

https://www.dropbox.com/s/qcxcbyyppg8p2ui/DRAGONS-GuideDuJoueur.pdf?dl=0

2. Read the document 


OBSERVED RESULT

It is slow to draw a page. It took seconds to do it and it is increasing little
by little and the CPU usage is going through the rough. I remove every option I
can to improve the performance but nothing change. I tried with evince and the
problem is not there.

EXPECTED RESULT

Smooth reading of pdf file.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)

Arch Linux

KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1

ADDITIONAL INFORMATION

Processor: 12 x intel Core I7-8750H
Memory: 15,2 GiB of RAM

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