Most people who use Logic Pro initially download the sound library to their computer's internal storage, but over the long term, you're likely to run out of space on your Mac. Moving the library to an external drive can save you a huge amount of space on your computer and improve performance speeds.
How to Move Your Logic Pro Sound Library to an External Drive
Move your Logic Pro sound library to an external drive to free up space on your computer as well as improve Logic Pro's performance speed.