What is Swap usage

[OpenWifi]

Hello guys, Kindly asking what is swap usage?

[NogBadTheBad]

https://www.geeksforgeeks.org/operating-system-swap-space/

[OpenWifi]

@NogBadTheBad Thanks. So my memory can be 90% and the pfsense box will still run effectively?

[Gertjan]

Yep.

Although, even when swap exists, I advise to check now and then that the system isn't using it.
If it does, add real memory, also called RAM.

As soon as the swap gets used, your system (pfSense) will start to crawl. The memory on disk is thousands of times slower as RAM access.