iPhone 4 laggy/patchy after 5.1 update.

hey guys,

every since updating iphone 5.1 been quite laggy/patchy. browsing internet, lags if type, scroll up/down, if switch app, open messages, etc.

functioning fine before update, ideas?

 

restore new best bet, upgraded 5.1 , 4s feels lot faster not wasn't before update.

 

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