The Mac Task Manager in 2026: How to Use Activity Monitor

The Mac's Task Manager is Activity Monitor, a free app built into macOS. Open it with Command-Space, type Activity Monitor and press Return, or find it in Applications > Utilities. It lists every running app and background process, shows how much CPU, memory, energy, disk and network each one uses, and lets you quit or force quit any of them.

If you've come from Windows, your first frozen Mac app brings a small panic: Control-Alt-Delete does nothing and there's no Task Manager in sight. Activity Monitor does the same job and a bit more. This guide covers how to open it fast, what each tab actually tells you, how to stop a stuck app safely, and which alarming numbers you can ignore.

How to open Activity Monitor on a Mac

Activity Monitor lives in the Utilities folder inside Applications, and Spotlight gets you there fastest. Apple lists Command-Space as the shortcut that shows the Spotlight search field in its Mac keyboard shortcuts list.

1. Press Command-Space to open Spotlight.
2. Type Activity Monitor (the first few letters are usually enough).
3. Press Return.

Other ways in: open Finder, choose Go > Utilities and double-click Activity Monitor, or open the Applications folder and then Utilities.

Keep Activity Monitor in the Dock

While Activity Monitor is running, Control-click its Dock icon, then choose Options > Keep in Dock, as Apple's Dock guide describes. I keep it there on every Mac I set up. The day an app freezes halfway through a screen share, two clicks beats typing anything.

The Dock icon can also become a live meter. In Activity Monitor, choose View > Dock Icon and pick one of the CPU options, Show Network Usage or Show Disk Activity. Apple's CPU, network and disk pages each cover the option for their tab. I leave mine on CPU, so a runaway process shows up as a full bar before the fans tell me.

Windows Task Manager vs. Activity Monitor: where everything is

Every common Task Manager job has a Mac equivalent, though a few of them live outside Activity Monitor. This table maps the habits you already have.

How to force quit a frozen app on a Mac

To force quit a frozen app on a Mac, press Option-Command-Esc, select the app in the Force Quit window and click Force Quit. Apple's force quit article also lists Apple menu > Force Quit, and the Dock guide adds a third route: Control-click the app's Dock icon and choose Force Quit. All three can throw away unsaved work, so give a beachballing app a minute first.

If Finder is the app that's stuck, the same window shows Relaunch instead of Force Quit. And if nothing responds at all, Apple's advice is to restart from the Apple menu, or as a last resort press and hold the power button for up to 10 seconds until the Mac turns off.

Quit or force quit from Activity Monitor

Activity Monitor can stop things the Force Quit window doesn't list, such as background helpers and menu bar utilities. These steps follow Apple's quit a process guide.

1. In Activity Monitor, find the app or process. Type its name in the window's search field if the list is long. Unresponsive ones are marked (Not Responding) in red.
2. Select it in the Process Name column.
3. Click the Stop button in the upper-left corner of the window.
4. Choose Quit to close it the way File > Quit would, or Force Quit to stop it immediately.

The difference matters. Apple says Quit only closes the process when it's safe and won't go ahead if that could lose data, while Force Quit stops it at once and you may lose whatever was in open files. I try Quit first on anything that might have a document open, and go straight to Force Quit for helpers that hold no work of mine.

How to use Activity Monitor: the process list

Activity Monitor's main window is a list of processes: the apps you opened, the system apps macOS runs, and background processes with no window at all. Apple's process guide explains the controls that make the list useful.

• Sort by any column. Click a column heading to sort, and click the arrow in it to flip the order. Sorting by % CPU or Memory puts the heaviest users at the top.
• Pick a view. The View menu filters the list: All Processes, My Processes, System Processes, Active Processes, Windowed Processes, GPU Processes and more.
• Add or hide columns. Choose View > Columns to choose what's shown.
• See details. Double-click a process, or highlight it and use the Info button, for a closer look.
• Change the refresh rate. Activity Monitor updates every 5 seconds by default. View > Update Frequency changes that, though Apple warns in its update frequency page that faster updates can affect overall performance.

When my MacBook felt sluggish before a client presentation, I switched to Windowed Processes and sorted by % CPU. It turned out a browser window I'd forgotten about, playing a muted video, was at the top. Filtering to apps with windows hides the hundreds of system processes and gets you to the likely suspect in seconds.

CPU tab: what's working your processor

The CPU tab shows how much of the processor each process is using right now. Below the list, Apple's CPU guide says System is the share used by macOS processes, User is the share used by apps you opened and the processes they started, and Idle is the share not in use. Window > CPU Usage and Window > CPU History open small floating graphs you can keep on screen.

A % CPU figure above 100% looks broken but isn't. The number adds up activity across every core, so a process using four cores fully can show around 400%, and a fully loaded eight-core chip can reach 800%, as Howard Oakley explains on The Eclectic Light Company. On Apple silicon the number also treats efficiency and performance cores the same, so read it as a ranking, not a precise measure of how hard the chip is working.

Why kernel_task uses so much CPU

High CPU from kernel_task is usually a sign of heat, not a problem to quit. Apple says kernel_task responds to conditions that make the CPU too hot, even if your Mac doesn't feel hot, and that it doesn't cause those conditions. It holds back other processes so the chip can cool, and settles down by itself as the temperature drops. Quitting it isn't the fix. Look instead for the app that's generating the heat, give the Mac some airflow, and let it recover.

Memory tab: does your Mac need more RAM?

The Memory tab's most useful part is the Memory Pressure graph under the process list, not the total. Apple's RAM guide reads it by color: green means your Mac is using its RAM efficiently, yellow means it might eventually need more RAM, and red means it needs more RAM.

A Mac showing almost all of its memory as used is normal. macOS fills spare RAM with cached files to speed things up, and Apple's memory guide breaks the total into these parts:

• Physical Memory: the RAM installed in your Mac.
• App Memory: memory in use by apps.
• Wired Memory: memory the system needs in order to operate.
• Compressed: memory squeezed down to make more RAM available.
• Cached Files: files the system keeps in otherwise unused memory to improve performance.
• Swap Used: space on your startup disk used to move data in and out of RAM.

I used to panic at a full memory bar. Now I only look at the pressure color: if it stays green with my usual pile of tabs, a spreadsheet and a video call open, the Mac has enough. If it sits in yellow or red for days, Apple's slow Mac page points to the same fix you'd expect: quit apps you're not using. To see whether your model's RAM can be upgraded at all, hold Option, open the Apple menu, choose System Information, then Hardware > Memory. If there's no Upgradeable Memory entry, Apple's guide says your Mac doesn't support memory upgrades.

Energy tab: what's draining your battery

The Energy tab ranks apps by Energy Impact, which Apple's energy guide describes as a relative measure of current energy use, where lower is better. On Mac laptops, the 12 hr Power column shows each app's average impact over the last 12 hours, or since startup if that's more recent.

• 12 hr Power is the column to sort by when your battery died early and you want to know why. The current figure only shows this moment.
• Preventing Sleep shows whether an app is keeping your Mac awake.
• App Nap shows whether macOS has put an app into its low-power nap.
• On laptops, the panel under the list shows remaining charge, time on battery and a Battery (Last 12 hours) graph.

I checked Preventing Sleep after my Mac stayed awake all night instead of going to sleep. A video conferencing app I'd left running was the culprit, and quitting it before bed ended the problem.

Disk, Network, GPU and Cache: the other views

The remaining tabs answer more specific questions, and most people only need them when something is clearly off.

• Disk shows how often your Mac reads from and writes to disk and how much data moves, per Apple's disk guide. Useful when the Mac stalls during a big backup or sync.
• Network shows packets and data sent and received, with totals and per-second rates, according to Apple's network guide. Sort processes by data sent to see which app is uploading in the background.
• GPU History (Window > GPU History) graphs graphics load. Apple's GPU guide suggests checking it when the Mac runs hot or the battery drains fast.
• Cache appears only when Content Caching is on in System Settings > General > Sharing, as Apple's cache guide notes. Most people never see it.

Run diagnostics when an app keeps hanging

Activity Monitor can write reports you can hand to a developer or Apple Support. Click the More button in the Activity Monitor window and choose one of the options described in Apple's diagnostics guide:

• Sample Process records what a selected process is doing over 3 seconds.
• Spindump creates a report for unresponsive apps that were force quit.
• System Diagnostics gathers logs from across your Mac into one report you can send to Apple Support.
• Spotlight Diagnostics reports on the processes running on your Mac.

When an app freezes the same way every week, a sample taken while it's stuck says far more to a support team than "it hangs sometimes." Attach it to your support ticket with a one-line description of what you were doing at the time.

A quick routine when your Mac slows down

When a Mac suddenly feels slow, these checks in Activity Monitor find the cause in a couple of minutes:

1. Open Activity Monitor and click CPU. Sort by % CPU and look at the top three.
2. If one app sits far above the rest and you aren't using it, quit it. If it's a system process you don't recognize, give it a few minutes before doing anything; background system work often finishes on its own.
3. Click Memory and check the Memory Pressure color. Yellow or red means memory is tight; quit what you don't need, and if it stays that way for days, see the Memory section above.
4. On a laptop, click Energy and sort by 12 hr Power to find the battery drains.
5. Check System Settings > General > Login Items & Extensions for apps that start on their own, and remove the ones you don't want, using the minus button as Apple's login items guide shows.
6. If nothing stands out and the Mac is still slow, restart it. Apple's slow Mac page also suggests checking that your startup disk has enough free space.

If the slowdown is one specific app, the fixes are often app-specific. Our guides to Outlook freezing on Mac, Microsoft Teams not working on Mac and the "zoom.us is not open anymore" error start from Activity Monitor and go further. And if copy and paste stopped working, restarting the pboard process is an Activity Monitor fix too.