mymarks
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How to Tell if a Mac Needs More RAM Using Memory Pressure
https://osxdaily.com/2026/04/27/how-to-tell-if-a-mac-needs-more-ram-using-memory-pressure/
Rather than focusing only on how much memory is being used, Memory Pressure reflects a summation of available free memory, memory compression, swap usage (virtual memory, which uses disk as temporary RAM), and overall system demands on memory. This makes it a much more useful metric than simply looking at RAM used or free RAM alone.