How to make games run faster on iPhone 3GS?

So I Downloaded Call of Duty Black ops Zombies. And it's so laggy… Is there anyway I can make it run smoother and faster?

End any running processes. If you double-click the home button it will open your task manager. Hold down on one of them and it will put an X next to each running process and you can end them. Also rebooting the phone before you play the game will ensure that the least amount of things are running in the background as possible.

Other than that, buy a newer phone with more CPU power.

Maybe you should try to update it every time there's an update? Or if you have it jailbroken (most likley) try deleting some games you don't play anymore, to make more gb space or something

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