I have some timings for using the caching system. These timings take into consideration the calibre overhead to do book matching and to determine whether any metadata must be sent back to CC.
The device is a slow Samsung Galaxy tab 10.1. Also, there are a zillion wifi hubs around me, so I don't get the best throughput that can be imagined.
100 books: cache off: 7.3 seconds. cache on: 2.4 seconds
500 books: cache off: 39 seconds. cache on: 4.6 seconds
1000 books: cache off: 60 seconds. cache on: 7.2 seconds
This seems to indicate that the time with the cache on is approximately 2 seconds plus .5 second per hundred books.
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