VitalsYour Mac’s vital signs. Red means something’s wrong.
Handy when agents run builds and tests you don’t see.
Free · Apple Silicon · macOS 14+
When something’s wrong, a light comes on.
The warning lights come first, only while one is on. Then C is CPU load and M is memory pressure, followed by the CPU and surface temperatures and the battery.
Memory is slowing the Mac down right now.
The Mac is slowing itself down because of heat.
The disk is almost full, so macOS can’t swap.
Kernel memory keeps growing. A restart usually fixes it.
M is memory pressure, not memory used.
RAM on a Mac is always full, and that’s fine. When more is needed, macOS compresses idle memory and moves some of it to the SSD. M shows how stretched it is: plain is fine, orange is tight, red is at the limit.
Activity Monitor · Memory Used 69%
Swap none
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The last 30 minutes of history, the temperatures and, on Macs where fan control is possible, the fans.
Every 5 seconds
That’s how often it samples. It redraws only when a number changes, because a monitor shouldn’t be what slows your Mac down.
Free · Apple Silicon · macOS 14+