All-mighty Mac system monitor

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Control CPU, memory, and whatnot with iStat Menus app.

Your Mac will take a while to gather information about your apps and then displays a list of all the apps on your machine. Find the column headed '64-bit (Intel)' and click on the column heading. Another method to check all the Running apps and programs on your Mac is through the Force Quit applications manager on Mac. Click on the Apple icon in the top menu bar of your Mac and then click on Force Quit Application in the drop-down menu (See image below). Mail is likely the default email app on your Mac, but just in case you have others downloaded, you can set the default reader. Here's how: Launch Mail from your dock or the Finder. Click Mail in the menu bar at the top of the screen. Click Preferences. Click the dropdown next to Default Mail Reader. Click the app you'd like to set as the default.

When your Mac slows down or starts behaving erratically, chances are it's because an application that's running, perhaps in the background, is misbehaving. And if it's not an application that's causing the problem, it will almost certainly be a process associated with macOS or an ancillary service.

Solving this problem is usually as simple as killing the process, but in order to do that you need to identify which one.Here's a comprehensive guide on how to view and kill processes on your Mac.

Best task killers for Mac

Try the best tools that help you find and kill processes hampering your Mac's performance.

How to show which processes consume a lot of memory

How To Check Background Apps Running On Mac

The easiest way to view all active processes running on your Mac is to launch Activity Monitor from your Applications folder. In the default CPU tab, you can see how much processing power every process takes, ranked by the most consuming. And if you switch to the Memory tab, you will see the same list ranked by the amount of used up RAM.

For more immediate and elaborate information on how your computer resources are consumed, use iStat Menus, which handily lives in your menu bar and, in its MEM table, shows you applications and processes that are consuming more than their fair share of RAM in real time.

How to kill process using Activity Monitor

Launch Activity Monitor.
The easiest way to launch Activity Monitor is to press Command and spacebar to call up Spotlight, then start typing Activity Monitor. When it appears in Spotlight, hit Return to launch it. Alternatively, go to Utilities in the Applications folder and double-click on its icon. Or open Activity Monitor in one click through iStat Menus app.
View and filter tasks.
You'll notice there are five tabs across the top of the Activity Monitor window: CPU, Energy, Memory, Disk, and Network. Clicking on any of those tabs organizes processes according to the percentage of the resource they are using. So, clicking on CPU lists tasks in the order of how much CPU capacity they're using. By default, processes are ordered starting with the one that's consuming the most of the resource at the top, so you can quickly see where problems are occurring or likely to occur. To flip the order, so that processes consuming the least of the resource are at the top, click the arrow next to Memory or CPU above the list of processes.
Kill problematic processes.
When you identify a process that's causing a problem, either because it's hogging lots of CPU cycles or memory, or because it's highlighted in the Activity Monitor as having crashed, you need to kill it. To do that, click on the process first and then on the X in the Activity Monitor toolbar. The process will quit and free up the resources it was taking up. If it's a critical process, it will restart. If it's an application, it will remain shut down.

Activity Monitor alternatives

Get an advanced system monitor for macOS – an improved alternative to the default program.

How to shut down processes using Terminal

Launch Terminal. Press Command and spacebar to pull up Spotlight then start typing Terminal. When the Terminal app appears in Spotlight, tap Return to launch it. Alternatively, navigate to the Utilities folder in Applications and double-click Terminal.
View processes. When Terminal has launched, type 'top' into the Terminal window. You'll see a list of currently running processes. At the top of the list is an overview of the processes that are running and the resources they're consuming.
Kill an unwanted process. When you identify a process that's causing a problem or consuming too many resources, take note of the number in the PID column next to the name of the process. To kill the process, type 'kill -9' followed by the PID number. Press Enter. The problem process will now quit.

How to prevent problematic processes

You can pretty much avoid issues altogether by being a little bit proactive in hunting down the common culprits. Here, iStat Menus will help you identify which applications or processes are consuming finite resources, such as CPU and RAM.

How To Check All Apps Running On Macbook

Then, you can use CleanMyMac maintenance routines that, when run regularly, will keep you Mac running smoothly. Here's how to do that:

Launch Setapp and search for CleanMyMac.
Find the maintenance scripts. Under the Speed section in the left sidebar, click on Maintenance. You will see a list of tasks that CleanMyMac would suggest you to perform to optimize your Mac. You should try to run them all, but the one especially important for us is under Run Maintenance Scripts.
Run the maintenance scripts. Click on the checkbox next to Run Maintenance Scripts and then click Run. Alternatively, choose another specific maintenance script such as Speed Up Mail or Reindex Spotlight and click Run. When it's finished, click Select Tasks to return to the list of maintenance tasks.

Run other tasks, as necessary. If you're having problems with Mail, repeat step 3, but this time click the checkbox next to Speed Up Mail. Likewise, if Spotlight is running slowly, run the Reindex Spotlight task.

How to kill a background process

To kill a background process, use Activity Monitor. While the steps are the same as described in the 'How to kill a running process using Activity Monitor' section above, the key difference is that background processes often have obscure names that don't clearly describe what they do.

Be careful when killing a background process and, if not sure, leave it alone or search online for its exact role in your system. Otherwise, you might risk causes problems for your macOS. Generally, background processes don't tend to consume significant RAM or CPU cycles, so if you spot one that does, it has probably got into trouble. Kill it using the X in the Activity Monitor toolbar.

How to easily remove startup items

How To Check Mac Os

One common cause of Macs running slowly or having problems is items that launch automatically at startup. These could be helper apps for something like iTunes or just complete apps in their own right. They are also frequently apps you once used but no longer need.

To review the apps and helpers that startup when you log in

Launch System Preferences from the Apple menu and click on the Users & Groups pane.
Click the padlock and type in your password.
Then select your username in the left panel and click the Login Items tab.
Look through all the login items that correspond to apps you no longer use and then click the minus button. The app will no longer start up automatically when you log in.

How to Force Quit an application that's not responding

If you see the dreaded spinning beachball, or an app just won't do anything, you should force quit it.

There are several ways to force quit an unresponsive application:

Press Command-Alt-Esc and click on the applicati