How to reduce the lag on my apps?

I have an iPhone 4 and I got an app that takes up some space on my cell but I still have enough space. Why does it lag so much? What can I do so it can run smoothly

Not sure, but maybe you should turn off GPS or any other system that doesn't need to be on while you're on your app.

Try to reset all your settings or restore the phone and start as new iPhone. Also try to download a app killer that automatically closes apps and free your iPhone RAM.

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