ftop

ftop puts a live view of the machine into one small floating panel instead of a terminal tab. It shows per-core load and frequency grouped by core type, memory use and pressure, network speed, GPU load, power draw and a temperature reading, plus a ranked list of the busiest apps with helper processes folded into their parent app.

The panel rearranges itself to fit whatever size you drag it to, shows only current values rather than history graphs, and stops sampling when it is hidden apart from one figure in the menu bar. The project targets Apple silicon Macs, and its GitHub releases are arm64 builds.