iphone 4 running slow why help

iPhone 4 RUNNING SLOW/WHY/HELP
location: apple.com - date: March 28, 2011
This is a refurbished unit which was given to me as a replacement for my original iPhone 4. I am noticing that the iPhone is just very laggy and slow with certain tasks. Such as opening/closing the camera applications, opening/closing the app store, downloading apps, loading up apps, playing games... the list goes on. Never really had these issues with my other iPhone. I have done 3 software restores and I still notice the lag.Help!
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