How to check the CPU usage on your computer to see how well it’s performing

You can check your CPU usage on a PC or Mac using programs already installed on your computer, like the Task Manager and ...
Ars Technica

CPU usage=65% while idle process=99%, how?

So what's likely the cause of such behavior? A bad driver? Any way to find out which? Clearly, based on how sluggish my system is the CPU is at 65% even though the process window shows only the idle ...
Ars Technica

XP Pro and CPU usage when moving mouse

I just installed XP Pro on a new build--A Gigabyte vtxh (kt266a). So far, seems to be pretty smooth.<P>However, I have noticed that, while idle cpu usage is 0-2%, when I move my usb mouse around, the ...