I made this mostly because I wanted something to signal to me that the CPU is running wild. With no fan, I often discover this a bit late, so I wanted just a very subtle indicator in the menu bar. I also added a UI in the browser which shows you some details, though nothing near the level of Process Explorer.
App Tamer will help you keep unruly apps under control, forcing them to run on efficiency cores instead of performance cores, slowing them down if they eat up more than X% of your CPU, stopping them entirely if they are in the background, and so much more.
The combo of iStat Menus and App Tamer is what makes it tolerable for me to have a MacBook Air as the primary laptop I use these days.
For enhanced automated management of the CPU, what program gets assigned to what type of CPU core, when a program might be slowed down or stopped, etc…. that’s where App Tamer comes in.
IMO, you need both monitoring and management.
App Tamer can do only so much in terms of monitoring what’s going on, and the control it gives you is limited to things that relate to CPU cores. It can’t apply the same kinds of controls to programs that are using too much memory, or causing too much disk utilization, or using too much network, etc….
But App Tamer can do a pretty good job of managing how your CPU cores get used by the programs on your system.
This has been the case for many years. It's likely that it only happens with the particular setup I use, as it's obviously a popular app with geeks, but it's prevented me from using it. I have purchased it, a couple of times, though, and have never asked for a refund. I really want it to work, and like Charlie Brown and Lucy, I'll keep trying.
I use RunCat for this! Or I guess "RunCat Classic" since they have some new version I haven't bothered to check out.