Task Manager is the fastest way to see what programs are using your computer's power

Task Manager is a built-in program that shows you which applications are running, how much memory and processing power each one is using, and which ones are slowing your computer down. On Windows, you can open it in three ways: press Ctrl + Shift + Esc all at once, press Ctrl + Alt + Delete and then click Task Manager, or right-click your taskbar and select Task Manager. On Mac, open Spotlight by pressing Command + Space, type "Activity Monitor", and press Enter.

Once it opens, you will see a list of running programs. The columns show you CPU usage (how hard your processor is working), Memory usage (how much RAM each program needs), and Disk usage (how much your hard drive is being used). Programs using the most resources appear near the top. If a program is frozen or not responding, you can select it and click "End Task" to force it to close.

Key Takeaways

  • On Windows, the fastest way to open Task Manager is Ctrl + Shift + Esc; on Mac, use Command + Space and search for Activity Monitor.
  • Task Manager shows you which programs are running and how much CPU, memory, and disk space each one is using right now.
  • If a program is frozen or using too many resources, you can select it and click End Task to force it to close without restarting your computer.
  • Checking Task Manager regularly helps you spot programs that run in the background and slow down your computer even when you are not using them.

Opening Task Manager on Windows

The quickest method on Windows is the keyboard shortcut Ctrl + Shift + Esc. Hold down Ctrl and Shift, press Esc, and release all three keys. Task Manager will open when ready in a separate window. This shortcut works on Windows 10 and Windows 11.

If that shortcut does not work, you can use Ctrl + Alt + Delete instead. This opens a blue screen with several options. Look for "Task Manager" and click it. This method takes one extra step but works on all Windows versions.

A third way is to right-click on your taskbar — the bar at the bottom of your screen where your clock and process icons live. A menu will appear. Click "Task Manager" from that menu. This method is slower than the keyboard shortcuts but works if you prefer using your mouse.

Opening Activity Monitor on Mac

On Mac, the equivalent program is called Activity Monitor, not Task Manager. Press Command + Space to open Spotlight, which is Mac's search tool. A search box will appear in the center of your screen.

Type "Activity Monitor" into the search box. You will see it appear in the results. Press Enter or click on it to open the program. Activity Monitor shows the same information as Windows Task Manager — which programs are running and how much CPU, memory, and disk space each one is using.

If you use Activity Monitor often, you can add it to your Dock for faster access. Once it is open, right-click the Activity Monitor icon in your Dock and select "Options" > "Keep in Dock". The next time you want to open it, you can click it directly from your Dock instead of searching.

Understanding what you see in Task Manager

When Task Manager opens, you will see a table with columns. The Name column lists every program running on your computer. Some are programs you opened yourself, like your web browser or email client. Others are background processes that Windows runs automatically — you may not recognize their names, and that is normal.

The CPU column shows what percentage of your processor each program is using right now. If a program shows 0%, it is running but not actively doing anything at this moment. If one shows 50% or higher, it is working hard and may be slowing your computer down. The Memory column shows how much RAM each program is using. The Disk column shows how much your hard drive is being read or written to.

Programs are usually sorted by CPU usage by default, with the heaviest users at the top. You can click any column header to sort by that column instead — for example, click "Memory" to see which programs are using the most RAM.

Closing programs that are slowing your computer down

If you see a program using a lot of CPU or memory that you do not need right now, you can close it from Task Manager. Click on the program name to select it, then click the "End Task" button at the bottom right of the window. The program will close when ready.

Be careful: closing a program this way does not save any unsaved work. If you have a document open in that program, you will lose any changes you have not saved. For this reason, it is better to close programs normally — by clicking the X button in the corner of the window — whenever you can. Use End Task only for programs that are frozen or not responding.

If you see a program you do not recognize using a lot of resources, you can search for its name online to learn what it does before closing it. Some background processes are important for Windows to run properly, and closing them can cause problems.

Programs that run in the background and use resources

Many programs run in the background even when you are not actively using them. Your antivirus software, Windows Update, cloud storage services like OneDrive, and browser extensions all run in the background. Some of these are necessary for your computer to work properly. Others are just waiting for you to use them again.

If you notice a background program using a lot of CPU or memory, you can decide whether you need it. For example, if you do not use OneDrive, you can close it from Task Manager and then uninstall it. If you rarely use a program, you can close it from Task Manager to free up resources, and it will not cause any problems.

Checking Task Manager once a week is a good habit. It takes only a minute and helps you spot programs that are slowing your computer down without your knowledge. Over time, you will learn which programs are normal and which ones are using too much power.

Frequently Asked Questions

What does it mean if a program says "Not Responding"?

Not Responding means the program has frozen and is not reacting to your clicks or keyboard input. This usually happens when a program crashes or gets stuck. You can select it in Task Manager and click End Task to force it to close. You will lose any unsaved work in that program, but it will not harm your computer.

Is it safe to close programs I do not recognize?

Some background programs are necessary for Windows to run. Before closing something unfamiliar, search for its name online to learn what it does. If it is a Windows system process, leave it alone. If it is a program you installed and do not use, closing it is safe. When in doubt, restart your computer instead — this closes everything and lets Windows start fresh.

Why does my computer slow down even when Task Manager shows low CPU usage?

Low CPU usage does not mean your computer is fast. Check the Memory and Disk columns too. If memory is nearly full or your disk is constantly reading and writing, your computer will feel slow even if the CPU is not working hard. You may need to close some programs or add more RAM.

Can I close Windows Update from Task Manager?

You can end the Windows Update process in Task Manager, but it will restart on its own. If updates are slowing your computer down, it is better to schedule them for a time when you are not using your computer. Go to Settings > Update & Security > Windows Update and click "Change active hours" to tell Windows when you are usually working.

Does closing Task Manager hurt my computer?

No. Closing Task Manager itself does nothing to your computer. You can close it by clicking the X button in the corner of the window. Closing Task Manager does not close any of the programs listed in it — it only closes the Task Manager window itself.