Share your experience!
Here are the problems
There is someway to go back to 2.3.7? Please sony, or fix this ICS or make a way to go back to GB...
It's not SONY problem
I have the same HW and SW like you but I don't have any problem with speed. So problem is 99% in some of yours 3rd party software...
I don't have any problem with speed too, cmon dude, ICS is really fast and smooth, i think it is better than GB in every aspect. About battery, you have to activate extended stand by mode, it will solve your problem.
Just do a repair via SUS
all your problems are all answered on different topics, you should learn how to use the search bar. the solution is just a repair using PCC/SUS.
And after repair make also Facotry Reset