Process Tamer web page is here: https://www.donation...proctamer/index.html
The program isn't a magic cure-all, and won't make your old pc suddenly into some super fast modern gaming workstation.
It's a small utility that can be useful in some situations, where you have a process that for some reason is dominating your cpu:
There are times when a process will hog your cpu, such as when converting audio/video files, or working with compressed archives. Because these processes completely consume the cpu, your system becomes sluggish to respond and using the computer for other tasks becomes impossible while these processes are running. Process Tamer solves this problem by identifying such these degenerate conditions and temporarily reducing the priority of the offending processes in order to allow your system to respond to other requests.
The other way that Process Tamer can be useful is in IDENTIFYING the processes that may hog your cpu and make it unresponsive -- if such behaviors are happening unexpectedly.
On a modern multicore cpu, a program like Process Tamer is less useful than on an older cpu, because the presence of multiple cores means that even if one process is completely hogging a core, your operating system may remain fully responsive by using the other cores.