Why is my iphone 5 lagging for everything?

I got my iphone the 3 days ago and a day after it started lagging/delaying every 5 seconds when i hit buttons or am typing. It lags for everything i do even going through settings. I haven't hooked it up to itunes but i reset it and its lagging the same way.before it started lagging i dropped it a foot and it got a tiny mark on the corner of the body, but if that was the problem it would be ridiculous, please help with advice or knowledge on the issue thanks.

Ask for help at your nearest Apple Store. IPhone 5 shouldn't lag, its benchmarks are faster than the S3's.

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