How can i fix the processer on my iPhone 3g?

I have an iPhone 3g that isn't connected to AT&T(I just use it as an ipod touch)...I dropped it on the processer and it started lagging A LOT so I just said whatever and jailbroke it...its really annoying how it lags and its not cuz of the jailbreak...someone please help...any ideas?
 
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