Hi Skip. Welcome to the forum. Good question.
I don't have an answer for you but I'd be interested in knowing too. Not that I use Pro Tools on a laptop anymore but for reasons regarding theft I've encrypted all of my local and remote drives at my location - that is, all but the system drives using FileVault.
I've not encountered any more problems than before, since encrypting the data drives, no new performance issues - just the usual ones.
No noticeable difference with Pro Tools either when comparing encrypted HFS and APFS partitions. (Though another story: encrypted APFS partitions are more likely to fail definitely, compared to encrypted HFS partitions, if problems occur - due to the less evolved rescue / repair tools made available by both Apple and third party as of yet. Be sure to backup everything.)
A modern, or at least an Intel CPU, should have an instruction set called AES-NI (Advanced Encryption Standard New Instructions).
Quote:
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Originally Posted by en.wikipedia.org/wiki/AES_instruction_set
The purpose of the instruction set is to improve the speed of applications performing encryption and decryption using the Advanced Encryption Standard (AES).
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As of my understanding, the Mac file encryption uses AES.