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I ran a Java applet, and it used over 200% of my CPU....
It actually rose to over 400% after I took the screenshot.
How is this possible? Can someone explain why Activity Monitor shows a task as using more than 100% of my CPU?
The CPU percentages shown in Activity Monitor are 100% for each virtual core. If you have a quad core processor with hyperthreading, 'real' 100% is 800% in Activity Monitor.