When you enable an app in the Optimize foreground apps list, your phone automatically optimizes system resources while you're using it.
 This helps extend your phone's battery life.
Note: This feature may not be available on all phones.
 
- 
 From the Home screen, tap 
, and then find and tap Boost+. 
 
- Tap Optimize foreground apps.
 
- On the Optimize foreground apps screen, tap the On/Off switch next to an app to turn it on.