What is chewing up my processor?

[zwiebelspaetzle]

About once a week, my computers gets bogged down hard. When I look in Activity Monitor, the CPU Usage graph is hitting the ceiling, but a quick glance at the CPU column in the process table above shows it should only be using about 30%.

My guess would be iAntiVirus is scanning in the background, but according to Activity Monitor, it's using less that 1% of the CPU.

Does the process table in Activity Monitor not really show all the processes? How can I figure out what is chewing up the CPU?

Thanks,
--Chris

 

[xUKHCx]

In Activity Mointor at the top there is a box that says "My Processes" change it to "All processes".

 

[miles01110]

or launch Terminal and enter the command

top