@CVR
If it is slow*, it is because of your system configuration, drive speed choice. Flash is many times lower than rotating magnetic.
Many of us have an 'Intake' Library, where we clan and massage before moving (using the same process) to the 'Main' library.
For me, on older HW, 20 books takes less than 30 seconds to do using Calibres 'Copy To Library" function. Loss is almost impossible as Calibre performs a 'Transaction' copy, the does the Delete only if the copy succeeds.
* My definition of slow is many hours
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