Free your device memory regularly by closing applications that you are not using. In order to do this:
Double tap the 'Home' (square) button on your device;
A list of all applications running in the background will now be visible;
Swipe the applications upwards in order to close them;
When all applications have been closed, launch the game again.
You can also try to shutdown your device, reopen it again and then launch the game. The device memory should free up at this point and the game performance should be improved.
Please note that our games run on devices that only meet the following minimum specifications:
iPhone 4s, iPhone 5, iPhone 5s, iPhone 5c, iPhone 6, iPhone 6+
iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad Mini, iPad Mini Retina, iPad Mini 3
iPod Touch 5th Gen
Graphics are optimized for and look best on iPad Air and iPhone 5s
Carnage is not supported on iPhone 4
It is strongly recommended that you run iOS 7