Defrag

[mattportner]

What is the best mac defrag app?
Do i have to defrag my computer? apple: iBook G4)
And if so, how often?

 

[MyJelleo]

https://forums.macrumors.com/threads/290823/

This answers a lot of your questions.

The last two posts are most important. You can pretty much ignore the rest.

 

[WildCowboy]

Here is Apple's support article on the topic.

Unless you routinely work with large files (>20 MB), you don't really need to defrag, since the OS does it on the fly.