Performance mode is a special configuration that can be applied to an app on your Android device. When this mode is enabled, the app will use more system resources in order to improve its performance. This can result in faster and smoother operation, but it also means that battery life will be shorter.
To turn on performance mode for an app, open the Settings menu and tap Apps. Select the app you want to configure and tap Advanced. From here, you'll see a toggle for Performance Mode; switch this to the On position. Once Performance Mode is enabled, you may notice a difference in how the app functions.