https://bugs.kde.org/show_bug.cgi?id=390971

            Bug ID: 390971
           Summary: Delayed content rendering during scrolling on a hidpi
                    screen
           Product: okular
           Version: 1.3.2
          Platform: Manjaro
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel@kde.org
          Reporter: bertyf...@gmail.com
  Target Milestone: ---

When slowly scrolling through a yet uncached pdf the content of the next page
is rendered (or displayed) with a significant delay.
I've recorded a video to better illustrate the problem
https://streamable.com/ynpjz
System settings: Screen Scale set to 2
Okular settings: View mode: Single page, Continuous; Memory usage: Greedy
Some additional observations:
- noticeable only on a hidpi screen
- better noticeable when the okular window is more wide; barely noticeable when
the window is tall; not noticeable when the View mode is set to Facing Pages; 
- happens on every Memory Usage setting

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