See Which Application Is Causing OS X Problems
Sometimes you may find that your Mac mini starts to respond slowly to your commands, even though no application has stopped working. When this occurs, you can use the Activity Monitor utility to see which application is consuming more of the processor’s cycles than it should. To resolve the problem, you can quit that application and then restart it.
If you cannot quit the application normally, you can force quit it. You can force quit it either from Activity Monitor or by using the Force Quit Applications dialog, as discussed in the following section.
See Which Application Is Causing OS X Problems
Click Launchpad () on the Dock.
The Launchpad screen appears.
Click Utilities.
The Utilities ...
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