[okular] [Bug 439723] New: While printing special sample file or generating a printer preview for it the UI freezes

[postix]

https://bugs.kde.org/show_bug.cgi?id=439723

            Bug ID: 439723
           Summary: While printing special sample file or generating a
                    printer preview for it the UI freezes
           Product: okular
           Version: 21.04.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: postix at posteo.eu
  Target Milestone: ---

Created attachment 139981
  --> https://bugs.kde.org/attachment.cgi?id=139981&action=edit
Flamegraph for CPU1

STEPS TO REPRODUCE
1. Open https://bugs.kde.org/attachment.cgi?id=139894 in Okular
2. File -> Printer Preview
OR 
2. File -> Print

OBSERVED RESULT

Okular uses 100% of one core for several seconds and the UI freezes until the
preview is finally generated.
I tried to use perf to check what it's going on, please find the flamegraph.svg
attached.

It seems to run on the same thread as the UI if I am not mistaken?


SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20210704
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.13.0-1-default (64-bit)
Source: openSUSE TW repo and source build (master)

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