What is Activity Monitor (or how to take your Mac's pulse)
Activity Monitor is a GUI application included with Mac OS X. It provides graphical representations of your computer's CPU, system memory, disk activity, disk usage, and network processes. This little utility is easy to overlook, but it can help you manage your memory and processing power when running lots of applications. If you prefer to work in the text-only Terminal application instead, you can view much of this information by using the top command.
By Giles Turnbull at MacDevCenter.
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