You can do the same thing on the Memory tab.

Be aware that many of the items in this list are system processes you won’t want to quit.

Select an app and click on the “X” in the top-left corner to quit the process. The higher the app appears in the list, the more CPU it is using. To find an app that is stressing your processor, click the CPU tab and then arrange the “% CPU” column in descending order. You can launch this tool via Spotlight (Command+Spacebar, then search for it) or find it in the Applications > Utilities folder. If your Mac suddenly becomes unresponsive, slows down, or its fans spin up, you might want to find the offending software using Activity Monitor. RELATED: Why Do Mac Apps Stay Open When I Hit The Red X Button? Identify and Remove Resource Hogs with Activity Monitor If the app has crashed or appears unresponsive, right-click its icon and hold Option, then click on Force Quit. Apps like Steam often run by default in the background, sapping resources. Get into the habit of closing thirsty apps like Photoshop or Excel when you aren’t using them. You can also use File > Quit, or use the Command+Q keyboard shortcut while the app is focused. You can right-click, Command-click, or two-finger tap an app icon in the dock and click Quit to end the process. Running apps appear in the dock with small dots next to them.

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