My laptop has more processing power when not plugged to the wall

[ihoss.com]

It seems like cpu usage drops when I pull out the power, like something is using the processor only when the power cord is in. The CPU usage is somewhere between 48% and 65% when the power is connected. When I pull it, It drops to 15% to 29%. And it is Firefox and Azureus who take up most processing power. When the power is connected, they account for 35%. When I pull the power, they use less than 10%.

I checked the power settings jason, but there is only controls for when the computer should turn off the screen, hard drive, etc. Nothing on CPU throttling.

Edit:
Ok, so if you write powercfg in the command line, you get lots of options, among them a way to throttle the cpu. I set the throttling to be the same on DC and AC, but it still lags on AC power.