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The Edit metadata window goes away slowly because after you edit metadata, calibre has to move the book files to a new location.
Sorting will become faster after the database refactoring.
Seeing the windows drawing is definitely not normal, even on my 6+ year old laptop that doesn't happen.
Adding books has a floor time because it takes place in a separate process. This is for robustness as sometimes metadata reading libraries written in C can cause segfaults which would take down all of calibre.
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