Why iphone4 cdma very slow using ios7

Recently I just bought iphone4 cdma then upgrade the os become os7, the problem is everything become slower, the motion isn't smooth, games become very slow and not working smoothly. What should I do? Can I downgrade it become os6?

Apple, please do us all a favor
Who are you talking to? We are not Apple.  Apple doesn't read these posts.

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    Who are you talking to? We are not Apple.  Apple doesn't read these posts.

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