How do I stop MS Edge from running a bunch of subframes?

Question

Every time I launch Edge it pegs my CPU for a long period of time and runs about 50 Subframes. Hos do I get this to stop?

Answer 1

Hello Ken Kuffell,

High CPU usage and excessive subframes in Microsoft Edge can be caused by a combination of browser settings, extensions, background processes, and even certain websites. Here are effective steps to reduce or eliminate this issue:

1. Disable Startup Boost

Startup Boost keeps Edge running in the background to launch faster, but it can spike CPU usage.

• Go to: edge://settings/system
• Inside "System", Toggle Startup Boost to Off

2. Disable Background Extensions and Apps

This prevents Edge from running tasks when closed.

• In the same settings page, toggle “Continue running background extensions and apps when Microsoft Edge is closed” to Off

3. Enable Efficiency Mode

This mode reduces resource usage.

• Go to: edge://settings/system
• Inside "Performance", Enable Efficiency Mode

4. Clear Cache and Cookies

Corrupted or bloated cache can cause performance issues.

• Press Ctrl + Shift + Delete
• Select All time and clear Browsing history, Cookies, and Cached files

5. Disable or Remove Extensions

Some extensions may be poorly optimized or malicious.

• Go to: edge://extensions
• Disable or remove unnecessary extensions

6. Check Edge’s Task Manager

Identify which tabs or processes are consuming resources.

• Press Shift + Esc in Edge to open its built-in Task Manager
• Sort by CPU usage and close problematic tabs or extensions

7. Scan for Malware

Malware can hijack browser processes.

• Open Windows Security
• Run a Full Scan under Virus & threat protection

8. Update Edge

Ensure you're running the latest version with performance fixes.

• Go to: edge://settings/help
• Install any available updates