Maybe you have no interest, but I will try to offer a different path (MB someone come in handy).
I upgraded for the reasons: steady job, application support, bug fixes older versions of iOS.
All the answers that have been made about the brakes is true.
Well, there is a problem (brakes) — decide it ))
Software overclocking: I'm not talking about the imaginary legend
, where we need to tweak the file and your MC will take off and give a performance.
Get rid of excess in the system. All systems initially written for a large circle and have a lot of things. When services, daemons, processes, etc. that consume resources of the phone, and we do not use, it would be wise to get rid of them and make life easier for the system, thus speeding up its work to get rid of the brakes.
All the available methods to accelerate already collected
in one list and in great detail described what to do.
I hope the thread someone will come in handy.