On my kobo touch loading an epub book is very fast (about 1 second even for large books). But closing books can take some time (up to 20 seconds). How long depends on how many books are stored on the device.
Everything runs smoothly with up to 100 books stored on the device. Between 100 and 600 books closing a book and loading the library starts to slow down to a level that is still somewhat acceptable provided you do not switch books constantly. Over about 600 books (which is about half the capacity of the internal memory) library loading time slows down to inacceptable levels and other bugs appear (such as loosing shortlist entries).
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