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My observation is that transferring books from Calibre to the Android "internal memory" is quite faster than to the external SD card; noticeable when I sent down all the books in the library. Even with 3 or 4 books at a time, time to the SD is slower than to "memory"; with 1 book I did see a slight hesitation prior to the start of the progress graph.
A "security/permission" check each time for a book? There was a big difference in time when I first loaded CC & then changed CC lib to the SD card; but then it was also a difference in CC version also.
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