How to Disable App Nap System-wide in OS X Yosemite

If you are on a Mac desktop and don’t care about the battery life gains that App Nap delivers, then you can disable the feature across your entire Mac.

 

Step 1. Open Terminal.app

 

Step 2. Enter this command

Step 3. Restart your Mac

You can use Activity Monitor to check to see if any of your apps hidden from view are using App Nap. Open Activity Monitor, click on the Energy tab and take a look at the App Nap column.

 

To reverse this change and bring back App Nap

Step 1. Open Terminal.app

 

Step 2. Enter this command

 

Step 3. Restart your Mac