[okular] [Bug 420770] New: okular-20.04.0: very sluggish scrolling behavior

[Till Schäfer]

https://bugs.kde.org/show_bug.cgi?id=420770

            Bug ID: 420770
           Summary: okular-20.04.0: very sluggish scrolling behavior
           Product: okular
           Version: 20.04.0
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: till2.schaefer at uni-dortmund.de
  Target Milestone: ---

Created attachment 128014
  --> https://bugs.kde.org/attachment.cgi?id=128014&action=edit
example of the scrolling behaviour

When scrolling fast with the mouse wheel through a document in okular 20.04.0
it is now a very sluggish experience. When using the scrollbar on the other
hand everything is very fast. 

I have attached an example video. You can see the jumpiness of the scroll bar,
when using the mouse wheel. Furthermore, the wheel scroll speed is almost
identical through this video. When it comes to the bottom of the document it
slows down a lot. In the second part of the video, I am using the scroll bar.
As you can see, the scrolling is much smoother. 

I am using 
Okular 20.04.0
Frameworks 5.69.0
Plasma 5.18.4.1

.. on a not so slow pc (i7-4790K, with Geforce GTX 970 (nvidia drivers 440.82)

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