A macOS system monitor in your menu bar
github.com
github.com
It's not like servers that are unattended but you're right there and know what's running.
It's just a distraction that doesn't gain any actionable intel unless you're running some weird or buggy apps that consume more resources than they should.
If you must check, there's always the official monitor app.
ahh, to live in a world where this caveat wasn't the norm
At a glance network monitoring is also very handy — I can check if an application is absolutely chewing through data (or quietly not actually doing anything at all), which is quite useful for metered connections.
Sometimes I see weird CPU spikes or memory leaks and report them. It basically replaces the old indicator lights for me but in a much better way.
There is indeed a performance cost. My experience is the good third party options are less resource intensive than the system option, but YMMW and there are a lot of options out there making all kinds of tradeoffs.
That said, there are definitely people who want to run a powerful and GUI-rich system stats tool and don't mind seeing graphs in the corner of their eye all day and giving up 5% of resources to run it. I'd venture most of us are running something that another person doesn't see the point in using.