[okular] [Bug 412616] New: GUI hangs with big pdf

[Richard Llom]

https://bugs.kde.org/show_bug.cgi?id=412616

            Bug ID: 412616
           Summary: GUI hangs with big pdf
           Product: okular
           Version: 1.7.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: richard.llom at gmail.com
  Target Milestone: ---

SUMMARY
When I open this pdf:
https://www.schraeder.com/images/PDF/Fibel_Waermerueckgewinnung.pdf, scroll in
the middle of the document and then change to another tab the GUI is hanging
and I cannot scroll in the other document for a couple of seconds. When I
switch to it GUI is hanging again for some time. I can repeat this for at least
50 seconds until the pdf fully is loaded/rendered and there are no hangs
anymore.
During all the time my 4-core CPU uses just about 113% (from 400%) and other
programs work just fine.

I have set memory performance to greedy, but this also happens under normal
settings.

CPU info:
Quad Core model: AMD A10-7850K Radeon R7 12 Compute Cores 4C+8G bits: 64 type:
MCP 
L2 cache: 2048 KiB 
Speed min/max: 1700/3700 MHz


STEPS TO REPRODUCE
1. Open any pdf document
2. open https://www.schraeder.com/images/PDF/Fibel_Waermerueckgewinnung.pdf
3. fast scroll to middle of document
4. switch tab to pdf from 1.

OBSERVED RESULT
GUI hangs

EXPECTED RESULT
GUI shoud'nt hang


SOFTWARE/OS VERSIONS
Operating System:  
KDE Plasma Version: 5.16.3
KDE Frameworks Version: 5.60.0
Qt Version: 5.12.4
Kernel Version: 4.19.26-1-CHAKRA
OS Type: 64-bit
Processors: 4 × AMD A10-7850K Radeon R7, 12 Compute Cores 4C+8G
Memory: 14,7 GiB of RAM

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