Game Booster is a feature to optimize your phone to play your favorite games.
To use this feature, open DFNDR Performance, tap on TOOLS tab and select the Game Booster feature.
1) Tap on "Add" to choose the games you want to speed up.
2) Select the games you want to accelerate by tapping on the "plus" (+) button.
3) You can also add a shortcut of DFNDR's Game Booster folder to your homescreen by tapping on "Options" (three dots button at the upper right corner).