A "real world" example: my Calibre library contains at the moment 5178 books, about 4300 of which are stored on two different Android tablets - a Nexus 7 and an Onyx T68 (that is, the same 4300 books are stored on each tablet), each managed by CC. When I connect either of the tablets to Calibre, CC takes less than 30s to do its initial sync.
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