How to make your iPhone run extremely fast?

I have a iPhone 4S that I have had for a little less than a year. It runs very smooth and fast, but I was wondering are there any tricks to make it run faster?

Create more space.

Closing the running apps will make performance more fast. Double tapping the Home button shows running apps, hold one running app and all of the running apps will start shaking, tap the (-) signs one by one to close them all.

Close all background apps.

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