Cached Files and Swap Used in mac's memory

Hi Apple Community,


I'd like to know what these cache files are and apparently, when I checked Activity Monitor it takes up a LOT of space. Is there a "way" to remove those?


And what is "Swap Used"? Sometimes I see it takes up some memory capacity, sometimes it doesn't. How does it work and what does it do in the long run?



I'm using a mac mini 2020, M1 16GB


Thank you!

Mac mini 2018 or later

Posted on Feb 7, 2021 6:43 AM

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Posted on Feb 7, 2021 8:58 AM

Swap = hard disk memory used by the system when RAM fills up. If you have a later Mac, it’s almost as good as RAM because of the high speed SSD. Your system isn’t even near the RAM limit, can ignore.


Cached Files = work files used frequently by the OS and various apps including Safari. I don’t worry about it; percentage-wise it uses roughly the same for my 8 GB mini. It also helps performance. Clearing Cache on Safari doesn’t affect this number significantly, neither does closing files and quitting apps. I’d forget about it.

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Question marked as Top-ranking reply

Feb 7, 2021 8:58 AM in response to fch041

Swap = hard disk memory used by the system when RAM fills up. If you have a later Mac, it’s almost as good as RAM because of the high speed SSD. Your system isn’t even near the RAM limit, can ignore.


Cached Files = work files used frequently by the OS and various apps including Safari. I don’t worry about it; percentage-wise it uses roughly the same for my 8 GB mini. It also helps performance. Clearing Cache on Safari doesn’t affect this number significantly, neither does closing files and quitting apps. I’d forget about it.

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Cached Files and Swap Used in mac's memory

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