Tab Performance detector in Microsoft Edge is a built-in tool that stops open tabs from using too much memory and CPU power so your PC stays fast when you run dozens of browser tabs at once. You can turn this feature on or off inside the browser settings.
Open a new tab in Microsoft Edge, type edge://flags in the address bar, and search for the performance detector setting to change it.
Go to Settings , then System and performance, and toggle “Enable performance detector” under the Performance section. This feature monitors tab resource usage and alerts you when tabs consume too much memory or CPU.
Why Use the Performance Detector?
The Microsoft Edge Performance Detector helps you find browser tabs that use too much memory and processing power. Turning on this tool lets you spot heavy tabs slowing down your computer so you can close or sleep them to make your browser run fast again.
The Microsoft Edge Performance detector watches for browser tabs that use too much memory or processing power. When the detector finds a tab using excessive resources, it alerts the user to address the issue.
How Does the Performance Detector Work?
The Microsoft Edge Performance Detector watches your open tabs in the background and shows simple visual alerts when a tab uses too many system resources. You will see a green indicator when a tab runs normally, or a red warning icon when a tab drains your computer’s memory.
When Microsoft Edge detects that your background tabs are using too much memory or processing power, a heart pulse icon with a red dot will show up in the toolbar.
Clicking the Performance detector icon shows "High usage" for memory and CPU. The gauge turns red, indicating high resource use. A list then appears, showing specific tabs consuming the most memory or CPU.
This action helps restore your computer's normal performance, with at least one tab typically showing a memory usage of over 300 MB.
Option 1Turn On or Off Tab Performance Detector in Microsoft Edge Settings
The Microsoft Edge Performance Detector can be turned on or off directly through the browser settings menu. Open the settings panel, select system and performance controls, and toggle the detector switch to change how Edge handles heavy tabs.
- Open Microsoft Edge.
- Click the Settings and more (Alt+F) button. It looks like three dots in the top right corner. Then click Settings.
- Click System and performance in the left pane. Then click Performance in the right pane.
If you do not see a left pane, click the menu button (three bars) at the top left. Or make the Microsoft Edge window wider until you see the left pane.
- Under General, turn on or off Enable performance detector.
Option 2Turn On or Off Tab Performance Detector Using Registry [Requires Admin]
The Microsoft Edge Performance Detector can be enabled or disabled for all users on a computer by editing the Windows Registry. This advanced method requires administrator access and involves changing specific registry values to control the feature across your system.
Open Windows Terminal as an administrator and run the command below. Or you can go to the Registry Editor and edit the value directly.
This option uses the policy for Microsoft Edge.
Always Turn On Tab Performance Detector for All Users
This will override and gray out Option One.
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge" /v PerformanceDetectorEnabled /t REG_DWORD /d 1 /f
Always Turn Off Tab Performance Detector for All Users
This will override and gray out Option One.
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge" /v PerformanceDetectorEnabled /t REG_DWORD /d 0 /f
Default to User Choice for Tab Performance Detector
This is the default setting. It lets users control the Performance detector using Option One.
reg delete "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge" /v PerformanceDetectorEnabled /f
More Information
Learn about performance features in Microsoft Edge - Microsoft Support Learn about other performance features in Microsoft Edge. These include sleeping tabs, efficiency mode, and the Performance detector.
Summary
The Microsoft Edge Performance Detector helps you spot tabs hogging resources, and you can control it through browser settings for your account or via the Registry for all users.
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About the Author
Richard
Tech Writer, IT Professional
Richard is a writer at Geek Rewind who turns complex IT tasks into clear, step-by-step guides. He draws on years of hands-on experience in system administration and enterprise IT operations, focusing on Windows, Linux and WordPress: the problems people actually run into, and the fixes that work. His server and WordPress guides come from systems he runs himself. Richard builds and maintains the platform behind Geek Rewind, from its Ubuntu servers and Nginx configuration to its custom WordPress plugins. Many new tutorials start with readers' questions, and he's always glad to answer them in the comments.
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