iphone 4 slow after updating to ios 6 and battery drain

hi guys... after updating my iphone 4 to ios 6...i am facing many problems.... first of all.... my iphone 4 has slowed down after upting to ios 6... ios 5 was better in all things...like battery,performance etc.... but updating also caused battery performance to drain quickly...i am getting upto 10 hours a day... i did a hard reset with fresh install of ios 6...i dont use 3g network.. nor cellular data... no location services, no push notifications.. no bluetooth... i use only about 10 apps.... but i all ways have wifi turned on..... if any suggestions would help me... appreciate...