Do you really think that these issues have not been considered when calibre was designed?
calibre does a copy not a rename, unlike finder or what have you. And the reason it does a copy not a rename it to prevent data corruption in case of failure. Which is also why this process cannot be run in the background.
calibre is designed to manage ebooks, ebooks are typically a few MB in size. If you want to manage hundred MB+ files, be prepared to wait, when chaning titles and authors, or dont use calibre.
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