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Sorry, but no, precaching does not solve this problem, at least not for me.
If you actually look through a pdf page by page and spend time on each page, it will work.
However, if you skim through something - say, a scientific paper - it doesn't help at all. I read papers not in linear order, I'm jumping all the time.
So obviously there is something needed that uses pre-rendered images instead of letting the pdf rendering happen on the device. That should be possible (no zoom though), and it will not affect storage size: a 900x700 16-grayscales gif should be around 60k.
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