Background content indexers can also effect bulk add performance. If you use any, make sure they're set to run as a low priority task - preferably such that the indexer only operates when system is otherwise idle.
FWIW I run MS Defender, Malwarebytes Pro, the Windows Indexer, and X1's Search indexer. My calibre libraries are not excluded from Defender or MWB, and they're explicitly included in the scope of the Windows and X1 indexers.
Right now the libraries are on a SATA III drive, and the indexes are on an NVMe SSD drive. But until recently both were on the same SATA II drive. I add 10-20 books a day, some of which are video clips. The AV and Indexing services have never had any noticeable effect on calibre's performance on either rig.
BR
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