How To Defrag Your MacBook Pro with HDD – Drive Genius
So while the need to defrag a Mac is fairly rare, it is still a useful process and could potentially help improve your workflow. Additionally, macOS only defrags files smaller than 20 MB so depending on your line of work, your larger files could be creating problems. For example, defragging become more useful the fuller your drive is due to the distribution of space. However, there are some limitations to the built-in features and specific scenarios where you would benefit from defragging your MacBook. Besides using an advanced file storage system that is less prone to fragmenting, files that are prone to fragmentation are automatically defragged by Mac OS X 10.3 and onwards.
Macs are known for being ahead of the curve when it comes to necessary functions like antivirus measures and file organization, so defragmentation is actually a process your Mac is already doing automatically. How To Defrag Your MacBook Pro with HDD – Drive Genius.