I have to admit that this is true and it was a very disappointing for the user-base to see that their phone got a unacceptable performance after the update. How

I have to admit that this is true and it was a very disappointing for the user-base to see that their phone got a unacceptable performance after the update. However Apple learned from it's lessons and the same thing didn't happen with 3 GS and the iPhone 4S.