Note: This article is for the new Microsoft Edge. Get help for the legacy version of Microsoft Edge.
With everything being online these days, it’s essential that your browser is fast, reliable, and keeps up with you. When it doesn’t, it can be deeply frustrating. We get that. In fact, it’s our mission to create a browser that never slows you down. We believe in having both productivity and performance.
Browser performance is essential to your success and is core to ours. We continue to deliver on our commitment to make Microsoft Edge faster, leaner, and more efficient than ever before. The following are our latest performance features.
Sleeping tabs
What are sleeping tabs?
To improve memory and CPU utilization of the Microsoft Edge browser, we've developed a feature called sleeping tabs.
Sleeping tabs puts background tabs to sleep after two hours of inactivity to free up resources for active tabs, new tabs, and other applications on your device. You can adjust the time interval by going to edge://settings/system. Sleeping tabs will fade to indicate they’ve released resources. To resume a sleeping tab, click on it like a normal tab. The tab will un-fade and your content will be immediately available.
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Optimize Performance, make sure Save resources with sleeping tabs is set to On.
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Next to Put inactive tabs to sleep after the specified amount of time, choose the length of time that's best for you from the list.
To help you stay on task and limit potential compatibility issues, the following activities prevent sites from going to sleep:
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The page is currently visible (active tab)
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The page is sharing its BrowsingInstance with another page
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The page is your company’s internal (intranet) site
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The page is currently being inspected by DevTools
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The page is currently playing audio
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The page is currently capturing a window or screen
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The page is currently capturing user media (webcam, microphone, etc)
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The page is currently being mirrored (casting, etc)
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The page is on the user’s block list in Settings
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The page is currently using WebUSB
We'll continue to adjust this list as needed.
You can add sites you never want to sleep to a block list in Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Optimize Performance, make sure Save resources with sleeping tabs is set to On.
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Next to Never put these sites to sleep, select Add, type in the full URL, and then select Add.
To change or remove a site from the Never put these sites to sleep list:
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Select Settings and more > Settings > System and performance .
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Under Optimize Performance > Never put these sites to sleep, select the 3 dots next to the site you want to update and select Edit or Remove.
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Optimize Performance, make sure Save resources with sleeping tabs is set to On.
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Set Fade sleeping tabs toggle to Off.
Sleeping tabs builds on the core of Chromium’s freezing technology. Freezing pauses a tab’s script timers, which minimizes CPU usage and frees up the operating system to reuse the memory for other open tabs, new tabs, or system applications.
A sleeping tab simply pauses the page, allowing Microsoft Edge to release system resources. Specifically, sleeping reduces CPU usage to the bare minimum, which helps reduce battery consumption as well as release some of the memory. The advantage of sleeping a tab is that going back to it again is fast and seamless.
A discarded tab completely discards the page content from memory, allowing all of the resources (CPU, memory) to be released. The downside is that when you go back to that tab, the page content needs to be fully reloaded.
You can turn off sleeping tabs by doing the following:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Optimize Performance, set the Save resources with sleeping tabs toggle to Off.
We offer group policies to:
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Turn on and turn off the feature completely
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Manage the time before an inactive tab goes to sleep
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Manage which sites should be blocked from going to sleep
These can be both mandatory or recommended group policies. If it’s a recommended group policy, IT admins will have the ability to set the default behavior that their users can change later, if they wish.
Efficiency mode
What is efficiency mode in Microsoft Edge?
Efficiency mode is designed to help extend battery life. It minimizes power usage by reducing resource usage through modifying background tab activity and some foreground activity, as well as putting inactive background tabs to sleep after 30 minutes or less of inactivity (if Save resources with sleeping tabs is on). Benefits may vary depending on your device, applications, and individual browser habits.
Balanced Savings is the option that we recommend. It helps extend your battery life by saving computer resources. When your device is unplugged, moderate steps are taken to save your battery. You should experience no or minor slowdowns when you browse. When your device reaches low battery, additional steps are taken to save your battery. With these additional steps, you may experience some visible slowdowns when you browse. For example, it may cause videos to be less smooth.
Maximum Savings is a good option when you can’t be connected to power for an extended period and need to conserve more battery life. With this setting, for the entire time that you are unplugged, additional steps are taken to save your battery. The changes being made to your browser will be the same as when additional steps are taken in Balanced Savings while on low battery. You may experience some visible slowdowns when you browse.
Efficiency mode will become active when your device is unplugged and will remain active until your device is connected to power or your laptop runs out of battery.
If you want efficiency mode to be active when connected to power, you can turn this on in Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Select Turn on efficiency mode when connected to power.
If you have Balanced Savings selected, you should experience no or minor slowdowns when you browse.
If Maximum Savings is selected, you will see better power savings, but you may experience some visible slowdowns when you browse. For example, it may cause videos to be less smooth.
We do our best to minimize efficiency mode’s impact to your browsing experience, but in some cases, it may cause videos to be less smooth, and you may experience some visible slowdowns when you browse. For scenarios where performance is important, such as gaming in the browser, we recommend excluding those sites from efficiency mode.
You can exclude a site from efficiency mode by adding it to a block list in Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Never put these tabs to sleep, select Add, type in the full URL of the site you want excluded, then select Add.
If Balanced Savings is selected, when your laptop enters battery saver mode on Windows or reaches 20% on Mac, efficiency mode will start taking additional steps to save your battery; however, you may experience some visible slowdowns when you browse. To indicate that these additional steps are being taken, a filled heart pulse icon will appear in your browser’s toolbar.
If Maximum Savings is selected, a filled heart pulse icon will appear in your browser’s toolbar when your device becomes unplugged. This icon indicates that additional steps are being taken to save your battery and that you may experience some visible slowdowns when you browse.
Select the icon to see the current status of the mode in the Performance menu.
When efficiency mode is on, it puts background tabs to sleep after 30 minutes of inactivity when your device is taking moderate steps to save your battery (if Save resources with sleeping tabs is on) and five minutes of inactivity when additional steps are taken to maximize savings. To set the amount of time using the sleeping tabs settings, turn off efficiency mode.
Although efficiency mode has advantages for battery-powered devices, it can also benefit desktop computers. Efficiency mode minimizes browser resource usage so the operating system can focus its resources on other running apps. However, if you enable efficiency mode, you may experience some visible slowdowns when you browse. You can turn this on for desktops from Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Scroll down to the Optimize Performance section.
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Set the toggle next to Efficiency mode to On.
You can turn off efficiency mode by going to Microsoft Edge Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Scroll down to the Optimize Performance section.
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Set the toggle next to Efficiency mode to Off.
The Microsoft Edge efficiency mode works on Windows, macOS, and Linux devices. The default for when the mode becomes active differs on each system:
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For Windows devices, it follows Windows Battery Saver mode.
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For macOS devices, it turns on at 20%.
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For Linux devices, it’s off by default.
We offer group policies to:
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Enable and disable the feature entirely
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Manage if efficiency mode is set to Balanced Savings or Maximum Savings
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Manage if efficiency mode will become active when a device is plugged in
These can be both mandatory or recommended group policies. If it’s a recommended group policy, IT admins will have the ability to set the default behavior that their users can change later, if they wish.
There are two different efficiency modes—the Microsoft Edge feature described above and a new Windows 11 feature.
The Microsoft Edge efficiency mode is a web browser feature that reduces power usage while you're browsing and is a separate feature from Windows efficiency mode. Turning off Microsoft Edge efficiency mode doesn't turn off Windows efficiency mode.
The efficiency mode you see in the Windows Task Manager status column is a new Windows 11 feature that automatically limits resources used by a single process or process group when high CPU use is detected. This improves device responsiveness for active processes, prolongs battery life, lowers thermal noise, and reduces stress on the CPU by lowering background process priority. Turning off Windows efficiency mode in Task Manager doesn't turn off the Microsoft Edge efficiency mode.
You'll know the Windows Task Manager efficiency mode is turned on if you see a green double leaf icon next to the process in the status column. Efficiency mode may cause instability for certain processes.
To turn off the Windows efficiency mode for a process in Task Manager:
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Select Start , enter Task Manager in the search bar, and select the Task Manager app from the list of results.
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Select the Processes tab from the left-sided menu, then search for the process you'd like to turn off.
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In the Name column, right-click (or select and hold) the process, then select Efficiency mode from the menu to turn it off. The green double leaf icon will disappear.
If you've selected a process group, select the right arrow on the left side of the process group name to expand it, right-click (or select and hold) the individual process you want to turn off, then select Efficiency mode from the menu.Note: Windows Task Manager efficiency mode can't be turned on or off for most process groups. For example, you can't turn efficiency mode on or off for the Windows Explorer process group, but you can turn individual File Explorer folders on or off from the expanded list.
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Repeat these steps to turn off efficiency mode for other processes.
You can turn the Windows Task Manager efficiency mode back on for one or more processes at any time by repeating the steps listed above.
The first time you turn on efficiency mode:
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A pop-up will display that says Do you want to turn on Efficiency mode for '[Process Name]'? Decide whether to select the Don't ask me again checkbox, then select OK to turn efficiency mode on for that process. A green double leaf icon will appear to the right of the process name.
Tip: If you select the Don't ask me again checkbox, the next time you turn on efficiency mode for any process you won't be asked to confirm.
You can also quickly turn efficiency mode on or off by:
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Selecting Start > Task Manager app > Processes tab, selecting the process name you want to manage, then selecting the Efficiency mode icon located in the top right corner of the Task Manager. If the icon is greyed out, efficiency mode is not available for this process group.
Performance detector
What is the performance detector?
Microsoft Edge proactively takes steps to minimize resource usage when your device is under pressure to keep your device running smoothly. One way Microsoft Edge does this is by putting tabs to sleep when memory pressure is detected on your device. Sometimes the proactive steps that Microsoft Edge takes are not enough to completely resolve the issue. For those instances, we built a feature called the Performance detector.
The performance detector helps identify high resource usage (memory (RAM) and/or processing power (CPU)) of background tabs and when an issue is detected, provides a way for you to fix it.
The performance detector can be found at the bottom of the performance hub:
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In Microsoft Edge, go to Settings and more > Performance.
In the performance hub, when resource usage is normal, the Performance detector will say Low usage next to Memory and CPU and the gauge below it will be green.
When Microsoft Edge detects that your background tabs are using too much memory (RAM) and/or processing power (CPU), a heart pulse icon with a red dot will appear in the toolbar to indicate an issue has been identified.
If you select this icon, the Performance detector will say High usage next to Memory and CPU and the gauge will be red to indicate an issue has been detected. Website tabs that are using the most memory and/or CPU will be listed under the gauge.
To help bring your background tabs memory and/or CPU usage back to green, you can use the performance detector to close or put to sleep high usage tabs.
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In Microsoft Edge, go to Settings and more > Performance.
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Under Performance detector, select the 3 dots next to any of the tabs listed, and select either Sleep tab or Close tab.
Every time you sleep or close a tab, the gauge will begin returning to green. Once it's green again, the performance detector will say "Low usage" and the list of tabs will disappear.
The performance detector works on Windows, macOS, and Linux and is turned on by default on each platform.
You can turn off the performance detector by going to Microsoft Edge Settings:
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In Microsoft Edge, select Settings and more > Settings > System and performance .
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Under Manage your performance, set Performance detector to Off.
We offer group policies to:
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Turn on and turn off the feature completely
These can be both mandatory or recommended group policies. If it’s a recommended group policy, IT admins will have the ability to set the default behavior that their users can change later, if they wish.
You can submit feedback through Microsoft Edge in two ways:
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On a Windows device, press Shift + Alt + I, follow the on-screen instructions and then select Send.
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In Microsoft Edge, go to Settings and more > Help and feedback > Send feedback, follow the on-screen instructions and then select Send.
