@Hoods7070 - my system - i5 2.3GHz, 6Gb RAM, SATA-2 Disk, Windows 7 64-bit, Calibre 2.1 - Data and System are on separate disks - both WD Caviar Blacks.
I just copied 280 books (305 MB) from library A (~25,000 books) to library B (~5,000 books) in 2m 51sec - with no duplicate checking, that can slow things down. That's more than I would normally copy. I routinely do a library A to library B copy of 10-20 books each day in a few seconds.
How do you tag, I tag in the Book List
I would guess its something that's monitoring writes. AV and Indexers spring to mind.
FWIW - I use the MSE AV, my libraries are Windows Search indexed and the drive is compressed.
About a year ago, to 'prove' that I had my AV and Indexing optimally configured, I excluded my calibre libraries from MSE and Indexing for a few days. I could not discern any difference in performance in calibre, or anything else for that matter, so I un-excluded everything again and left the settings as they were/are.
BR
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