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One odd thing, which may or may not be enlightening:
Before I compressed the database, I tried to improve things by removing all of the pdf files on the device (which it isn't much good for reading them anyway) - it was a little under 200 pdf books. After I'd done that, the time taken to perform the "Get list of books on device" process JUMPED from about 8 mins to nearly 13 minutes. So: fewer books on the device; more time to "Get list".
Now, having compressed the database, that time has gone down again - but only to 9 mins. - so, not as fast as it was BEFORE I removed the pdf files.
Any ideas as to what might explain this?
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