When I use Okular, there are certain files that if you zoom in and move around, the Okular Flash to white for a while and then shows the content.
I tried other PDF reader like the xpdf. The xpdf only flash when zooming but it doesn't flash if you just move around. The flashing is very annoying if you have to zoom and move to different areas.
I tried to set performance to greedy(I have 24G ram) and it doesn't help. If possible I wish not to install another PDF reader, is there any way to improve this?

By the way, The PDF file I was reading.
https://drive.google.com/file/d/1OxK5fL ... sp=sharing

Thanks for any reply