taskpolicy

Per-process power modes for Apple Silicon Macs: run any process at full power, on efficiency cores, or duty-capped for quiet, from the menu bar. No sudo, no kernel extensions.

Free, open-source macOS process & priority monitor. One click moves a CPU hog into the macOS background band — reversible, no admin rights — so the app you're actually using stays snappy. A free App Tamer alternative and the reprioritize button Activity Monitor never had.