Microsoft Edge comes with a built-in efficiency mode to minimize power usage by saving computer resources.
Disable Startup boost toggle under System. Select System and performance from the left sidebar. Select the three-dot menu in the top right corner and open Settings. When it’s on, the feature helps Microsoft Edge open faster when you start your device. Microsoft enables startup boost by default on Edge. Check Microsoft Edge CPU usage from the Activity Monitor.Press the Command + Space keys to open Spotlight Search.
Select Microsoft Edge and confirm double-digit CPU usage. Press the Ctrl+Shift+Esc keys to open the Task Manager. First, we will show you how to confirm Microsoft Edge high CPU usage on Windows and Mac and go through troubleshooting steps to fix the issue.