[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor

[Filzmaier Josef]

https://bugs.kde.org/show_bug.cgi?id=409644

--- Comment #4 from Filzmaier Josef <j.filzmaier at gmx.at> ---
It does not seem to be dependent on the file format / generator.
I have tested with pdf, txt and epub, and tiff - all have laggy scrolling.

I am using Okular 21.04.3 but can also reproduce it with the current master
branch.

I have built okular from source, if you can point me at interesting source
files to debug i am glad to help.

The Effect is especially extreme if i unplug the device (e.g. when TLP enables
some power saving features like power_save cpu_governor etc) so it does seem
like a performance regression

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