If game runs slowly try to kill backgroundapps and disable visual and/or sound effects in game settings. Ifgame still runs slow, then I'm sorry =).

-great action shooting game
-controll your gunnery ship
-fight more than 25 types of enemies
-use more than 10 unlockable weapons to destroy them
-collect bonuses
-compete world-highscore
-play 4 different game modes
-awesome graphics and sounds
-no ads

Location is needed for highscores.