Activity Monitor lists a thousand processes, a hundred of them called Google Chrome Helper. Vitals adds every helper to the app that launched it, so you see 60 apps instead of 1,000 processes, each with one figure for memory, CPU, energy, disk and network. It keeps 30 days of history, alerts you when an app misbehaves, finds forgotten dev servers, and shows temperatures, fans and battery. Every readout can sit in your menu bar, arranged your way. Pay once. No subscription, no account.
CleanMyMac by MacPaw
Thanks, this is fair, and you were right.
I measured it today and found Vitals was still doing work for its window after you closed it. That's fixed in the next update: it uses less than half the CPU and about a third less memory when it's sitting in the menu bar.
There's more to trim, and I'm on it.