IPhone slow after downgrade 3.1.3?

[mAm~RAMO~mAm`]

I was on 4.2.1 and downgraded to 4.1. It wasn't working out so I downgraded to 3.1.3. How come my apps are so slow. When I play a app like tiny wings it lags alot which wont even be usable for myself.

 

[Shalma]

do back up....................