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Thanks for all your responses guy. Kavid thank you for clarifying that Calibre is doing a copy and why the process will not run in the background. I also understand the point that this metadata is unlikely to change more than once. And no I am not using slow external storage. However, I'm still a little curious here. I actually timed the operations for 3 of these PDF files when editing metadata and doing a *copy* in the Finder. Here's what I get:
### Calibre (change title name)
45 seconds for 260.6 MB file
54 seconds for 319.6 MB file
61 seconds for 340.1 MB file
### Finder (copy file)
16 seconds for 260.6 MB file
16 seconds for 319.6 MB file
20 secondss for 340.1 MB file
Why is there such a large time difference?
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