If by scrolling you mean moving through the book list one at a time, then it is slow because the book details have to be rendered, the cover browser updated etc,
If you mean just scrolling the book list without changing the current book, it can be a little slow because the book list dynamically loads data as you scroll (i.e. the list of rows is not pre-rendered). This is a scroll performance/memory usage/startup time tradeoff.
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