PDFs are kinda weird because there are somehow always PDFs that slow one viewer down but usually another viewer is fine. E.g. I have PDFs where Okular takes a c

PDFs are kinda weird because there are somehow always PDFs that slow one viewer down but usually another viewer is fine. E.g. I have PDFs where Okular takes a couple seconds to render the first page, while LLPP renders it much faster. And vice versa -- which is the confusing part.