Identify the problem tabs or processes

1. Open your browser

2. Press Shift + Esc in Chrome or about:performance in Firefox

3. Look for tabs or extensions using unusually high CPU

4. Close or reload the problematic tabs/extensions

• Go to:

  • • Chrome: chrome://extensions/

    • Firefox: about:addons

• Disable all extensions.
• Re-enable them one by one to find the one causing the spike.

Clear Browser Cache

1. Open browser settings

2. Go to Privacy & Security -> Clear Browsing Data

3. Clear:

• Cached images/files
• Cookies

Update the Browser

1. Go to:

• Chrome: Settings -> About Chrome
• Firefox: Help -> About Firefox

1. Install available updates

2. Restart the browser.

Disable Hardware Acceleration ->Probably the most important, if you have an older/cloggged machine

Sometimes hardware acceleration causes CPU spikes.

1. Go to Settings -> System (Chrome) or Settings -> Performance (Firefox)

2. Turn off “Use hardware acceleration when available”

3. Restart the browser.

Check for Malware or Adware

1. Run a malware scan using Windows Defender

2. Remove detected threats

3. Restart the PC.

Check System Resource Conflicts

If CPU usage remains high even with the browser closed:

1. Open Task Manager (Ctrl + Shift + Esc)

2. Check for background processes related to:

• Sync apps
• GPU processes
• Antivirus
  Disable or exit unnecessary programs.

Reinstall the Browser (If Necessary)

If the issue persists:

1. Uninstall the browser

2. Download the latest version

3. Reinstall and test again.