If you need to keep an eye on the usage of your CPU then PerfMonitor allows you to see what's happening at all times.
PerfMonitor is basically a processor performance monitoring tool which allows you to track the frequency of up to four processes. It can be used to identify performance bottlenecks or to monitor a program that may be hogging your CPU.
There are no fancy touches to this app and it could do with a few more tips as to what the various parameters are. It displays in graphical format - a bit like a graphic equalizer - the activity of your CPU at any one time.
PerfMonitor is a great tool for system administrators or those that need to get to the bottom of a CPU hogging issue.