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Mmm.. well, in my case it's all exactly the opposite. The library UI is fine and very responsive. The default reading app takes time to do any action, and there sometimes appears a rotating hourglass that stays for quite a while and does not allow you to go one reading. For instance, if I click on an endnote number that brings me to another page and I then click to go back to the original page, the app freezes completely.
Koreader is, on the contrary, very smooth; I haven't had any issues with it so far. You would think that one is the default one.
Regarding the update, I did check when I bought it for a new version, but it turned out that it is up to date.
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