But most of the time, I choose Force Quit anyway. Force Quitting is riskier, if it’s an app that has unsaved changes-like, say, a Word document. Then you choose whether to Quit or Force Quit it. To quit a process, click on it, and then click the Quit Process button. But if my Mac’s going too slow, and I see, say, iTunes is up there gobbling up 90 percent or more of my CPU, I’ll gladly shut the app down to see if that improves things in a hurry. What we’re looking for is an app that’s misbehaving, one that’s gobbling up more than it s fair share of CPU, and for too long a time. Now, things hop around a bit in Activity Monitor, and that’s normal different apps and processes are always running on your Mac, and sometimes will need to use a bit of extra CPU processing power-so don’t worry about that. You might have to click on it twice to ensure that processes using the most CPU are sorted at the top. To do that, you want to sort Activity Monitor by the “%CPU” column-so click on it. When trouble’s afoot, you generally want to find out which app is dominating your Mac’s processors. Activity Monitor shows all the apps and processes that are currently running on your Mac.

Macdown laggy