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Also do the following:
On the library menu, say Check library.
This will compact your db.
(Do this often if you change your db-info regular)
A lot of extra info is kept in the db also when it is removed from your library. This is not a calibre bug, it is a performance-boost option for this type of db. You do not have to remove info from the db so it is fast. But if you change a lot of info, your trash-data becomes bigger and that will cause loss of performance in time.
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