A problem from the first 128K Mac, virtual memory was available from 1987 but only with A/UX. It wasn’t really sorted out until Mac OS X, and now it’s all Unified anyway.
virtual memory
For a while, most users worked in Mac OS 8.6, 9.0 was new and a beast, and there was also the Public Beta of Mac OS X. So how did we manage memory then?
They’re everywhere: whatever you do, something somewhere will cache it. Later that can cause puzzling problems, but makes our Macs faster as a result.
In extreme cases, excessive use of swap space on an internal SSD could lead to its premature death, and the end of life for that Mac. How could you assess that?
The Eclectic Light Company 