[okular] [Bug 415400] Okular stumbles while scrolling through a heavy epub

[Alexander]

https://bugs.kde.org/show_bug.cgi?id=415400

--- Comment #2 from Alexander <koshka at koshka.ddns.net> ---
1) I don't understand how a plaintext document can be rendered so
inefficiently.
It takes time for Okular to do pagination of a book, which, AFAIK do not have a
notion of a page (fb2, mobi), it's OK. But then it stumbles over each page! A
page with about 40 rows of text on it.
On my Acer C720 Okular freezes completely for about a second, then has about 3
seconds of considerably deteriorated performance.
It doesn't take so much time to render a similar or even more complex pdf page.
Only pdf pages with complex graphics take much time to render.

2) If a user was patient enough and slowly scrolled through some pages they
become quickly accessible. Kind of "pre"-loaded. User can scroll smoothly back
and forth in the range of these pages. So, maybe some kind of prefetch could be
done to improve performance? Maybe even all book could be situated in RAM in a
form suitable for rendering? Does it take too much RAM?
By the way, Okular Settings [Configure Okular -> Performance -> Memory Usage]
seem does nothing for non-pdf formats.

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