[okular] [Bug 431847] New: Slow Rendering of PDFs (comparing to other rendering engines).

[Jack]

https://bugs.kde.org/show_bug.cgi?id=431847

            Bug ID: 431847
           Summary: Slow Rendering of PDFs (comparing to other rendering
                    engines).
           Product: okular
           Version: 20.12.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: jack6566 at mailna.me
  Target Milestone: ---

SUMMARY
Okular renders very slowly comparing to the other rendering engines.

STEPS TO REPRODUCE:
1. Load any avarage PDF (30-40 pages, lots of text, some small-ish photos)
2. Scroll intensively
3. Compare the speed to muPDF-gl version
The difference between Okular (slow) and muPDF-GL (instantenous) is quite huge.


EXPECTED RESULT
Fix for instantenous render like the competition.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Arch
(available in About System)
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.12.2

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