How Save Memory in Edge browser with Sleeping Tabs feature?

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Microsoft Edge comes with a built-in feature Sleeping Tabs. It is known as “Tab Sleep” in Firefox and “Tab Snooze” in Opera. When this feature is turned on, then Edge puts inactive tabs (that you haven’t accessed for a few minutes) to sleep mode or suspends those tabs to save the memory. That feature is beneficial so that tabs won’t occupy system resources or memory (CPU and RAM) unnecessarily.

In other words, once you open multiple tabs in any web browser, the browser will start using more system resources (CPU and RAM) to keep the tabs running in the background. Even if you are not using those tabs (i.e., not visiting the webpages opened in those tabs), the tabs keep utilizing many system resources, and that is unnecessary. Whenever you access any of the inactive tabs, those are waked or bring back to the active mode with a refresh. This feature is advantageous if your PC or laptop has low memory or installed lesser RAM.

The Sleeping Tabs feature of the Edge browser automatically detects tabs that have not been used for a specified time period and put those inactive tabs to sleep (i.e., discharges or suspends those tabs from memory). According to Microsoft, the Sleeping tabs feature helps save up to 29% of system resources, including battery power.

If you don’t find this feature useful, you can easily disable it using some simple steps.

How to Enable or disable Sleeping Tabs in the Microsoft Edge browser?

Note: Sleeping Tabs feature is available in Microsoft Edge 87 and later versions only. If you don’t find the Sleeping Tabs feature in the Edge browser, you need to update the Edge browser to the latest version.

By default, the Sleeping Tabs feature is not enabled in Microsoft Edge, so you need to manually activate and enable it if you are interested in this feature. Microsoft has provided a secret preference/flag to turn on/off the Sleeping Tabs feature. To enable or disable the Sleeping Tabs feature to save the resources or memory in the Microsoft Edge browser, do the following steps:-

Step 1. Open the Microsoft Edge browser and type edge://flags/ in the address bar, and press Enter from the keyboard.

Step 2. Type sleep in the “Search flags” box.

You will see the following options:-

Enable Sleeping Tabs

Automatically puts idle background tabs to sleep to save resources. – Mac, Windows


Enable immediate timeout for Sleeping Tabs

Ignore the Sleeping Tabs timeout setting and put background tabs to sleep immediately. – Mac, Windows


Sleeping Tabs use observed site characteristics heuristics

Sleeping Tabs should consider observed site characteristics as heuristic violations when opting-out domains. These characteristics are related to background notification, such as modifying the tab title text, favicon, or playing the audio while backgrounded. – Mac, Windows


Step 3. To enable and activate the Sleeping Tabs feature, set the “Enable Sleeping Tabs” option to Enabled using the drop-down box.

Step 4. Click the Restart button from the right-side bottom of the Edge browser.

Now, the Sleeping Tabs feature is successfully activated.

The other two options are unnecessary; however, if you want to immediately put inactive tabs to sleep as soon as you leave the tabs, set the “Enable immediate timeout for Sleeping Tabs” option to Enabled using the drop-down box. Finally, click on the Restart button.

Once you have enabled the Seeping Tabs feature on the Edge browser, you can customize or configure Sleeping Tabs functionality using the Microsoft Edge Settings page. To access the Settings page, click on the 3-dots menu button present on the right side of the toolbar and select the Settings option from the main menu. Alternatively, directly open the Edge Settings page using the edge://settings/ URL in the address bar.

Click on the System tab, and in the right-side pane, you’ll see the “Save resources” section.
From the “Save resources” section, you can save the resources by turning on the “Save resources with sleeping tabs” option.
You can specify the time when the Tab will be considered inactive tabs in Edge by selecting the timing of inactivity from the option “Put inactive tabs to sleep after the specified amount of time.” You can select the option 5 minutes of inactivity, 5 minutes of inactivity, 15 minutes of inactivity, 30 minutes of inactivity, 1 hour of inactivity, 2 hours of inactivity,  2 hours of inactivity,  3 hours of inactivity,  6 hours of inactivity, or 12 hours of inactivity.
If you want to exclude a web page from the Sleeping tabs, click the Add button next to “Never put these sites to sleep.”
A new window will open with a title, Add a site.

Enter the URL that you want to exclude from the Sleeping tab feature and click the Add button.

To disable the Seeping tabs feature, in Step 3 above, set the “Enable Sleeping Tabs” option from Default to Disabled.

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