okular is very slow to render pdf files
I open the issue on kde bugsystem for okular but I have been told to open an issue here on poppler. I must emphasize that the problem does not exist with evince (poppler based) or muPDF sor for now I am using evince or mupdf as workaround.
STEPS TO REPRODUCE
- open a 'large' pdf with images (it is easier to see it) like that one:
- Read the document
It is extremely slow to draw a page. It took seconds to do it and it is increasing little by little and the CPU usage is going through the rough. I remove every option I can to improve the performance but nothing change. I tried with evince and the problem is not there.
Smooth reading of pdf file.
Linux/KDE Plasma: (available in About System)
KDE Plasma Version: 5.18.3 KDE Frameworks Version: 5.68.0 Qt Version: 5.14.1
Processor: 12 x intel Core I7-8750H Memory: 15,2 GiB of RAM