[okular] [Bug 414228] New: 100% CPU usage and lag when scrolling

[Lars Veldscholte]

https://bugs.kde.org/show_bug.cgi?id=414228

            Bug ID: 414228
           Summary: 100% CPU usage and lag when scrolling
           Product: okular
           Version: 1.8.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: lars at tuxplace.nl
  Target Milestone: ---

SUMMARY
Scrolling of PDF files in Okular 1.8.3 is very laggy and consumes 100% CPU (on
one thread) while the scrolling animation is running.

STEPS TO REPRODUCE
1. Open a PDF file in Okular.
2. Scroll.

OBSERVED RESULT
The scrolling animation has low framerate, lags behind the input actions, and
consumes 100% CPU on one thread.

EXPECTED RESULT
Smooth, snappy scrolling.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma
KDE Plasma Version: 5.17.3
KDE Frameworks Version: 5.64.0
Qt Version: 5.13.2

ADDITIONAL INFORMATION

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