[okular] [Bug 469886] New: PDF Rendering issues: Takes many seconds to render new page and renderings are not cleared on zooming

[postix]

https://bugs.kde.org/show_bug.cgi?id=469886

            Bug ID: 469886
           Summary: PDF Rendering issues: Takes many seconds to render new
                    page and renderings are not cleared on zooming
    Classification: Applications
           Product: okular
           Version: 23.04.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: postix at posteo.eu
  Target Milestone: ---

Created attachment 159030
  --> https://bugs.kde.org/attachment.cgi?id=159030&action=edit
Screenshot

SUMMARY

I have a series of certain PDFs, which however I may only share privately for
debugging purposes to the corresponding maintainer

```
Creator:         Acrobat PDFMaker 17 for PowerPoint
Producer:        Adobe PDF Library 17.11.238
Custom Metadata: no
Metadata Stream: yes
Tagged:          yes
UserProperties:  no
Suspects:        no
Form:            none
JavaScript:      no
Pages:           54
Encrypted:       no
Page size:       720 x 540 pts
Page rot:        0
File size:       3434637 bytes
Optimized:       yes
PDF version:     1.7
```

for which Okular is unfortunately unusable:

* When changing the page by either scrolling (mouse wheel, keyboard arrows,
page up / down key) it takes ages
* When zooming in or out, parts of the smaller / bigger page are still
displayed

It works however fine with Xournal++ 1.1.3, which also uses the poppler
library.


SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20230514
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.1-2-default (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Poppler: 23.04.0
Memory: 31.2 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series

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