Hi everyone, Atta here. I make Vitals, an Activity Monitor alternative for Mac. Version 1.10 lets you control your Mac's fans.
macOS waits before it speeds the fans up. On a MacBook Pro, they often stay at their slowest until the chips are already hot, then catch up.
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.