Game Lag in iPhone 4

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Hi friends,
i developing a game in Unity of version 4.1 for ios,but iam facing one problem when i install the build in iPhone 4, then game lags,it not smooth and when it install in iPhone 4s or iPhone 5 then it work fine,
i want to that my game work fine for iphone 4 also.how to resolve this issues.
please help.

It is 2d type game and i used 2d Tile Map Package for creating path in only one scence.There are 10 scences in the apps.i used packed sprite package for animations of objects and also set the Quality setting for rendere issue and also change build setting, but no more effects.Now i attached the Screenshoot of Build setting and Quality Setting.[18181-qualitysetting.png|18181] Please help me.

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Hi everyone, Thanks for your feedback.

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1 Answer

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The iPhone 4 has a lousy GPU, so you can either reduce the graphics a lot, or use a lower resolution, or just forget it since it’s getting old and fewer people use one now.