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Originally Posted by kacir
Looking for duplicates works differently than you think. When I have Robinson Crusoe.epub already in database and when I drop in Robinson_Crusoe_-_D._Defoe.pdf I expect that the system will recognise newly added book as a "duplicate" and merge it with the existing record.
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Merging into an existing record will only happen if the autosort/automerge option is turned on (In Preferences, Import/Export, Adding Books). That option looks for exact match on Author and similar Titles. By default Calibre will not "merge it with the existing record" and will simply identify the title as a duplicate and ask if you want to add it as a separate, new record, or not.
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I prefer not to use autodetection, I usually use complicated Regular Expressions to get most of the metadata I am interested in from the filename.
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I also use only the filename for metadata. Internal metadata is notoriously bad. (I'm not sure what you call "autodetection" - if it's detecting internal metadata, I agree it's better not to use that for many books. If it's the autosort/automerging option that puts the book into existing records, then you are using it.)
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I DO wish the Calibre was faster, especially with large number of books, but the slow-down is not as catastrophic as you experience.
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You should have used it 9 months ago. There have been numerous speed improvements. It's much, much faster now. There are inherent limits on the speed due to the need to support multiple OSs, but what can be done on speed will be done, it just takes time.