Default what would the rout add to this device?? "considering it"

What apps is out there to enhance the speed and battery life of the device.....and I mean REAL enhancement not the likes of battery doctor and this ****ty apps

And is there different types of rout or what?

And what about the next update? Would I be able to get it?

And at last what is the best custom rom for the 601?

Sorry guys I am little new to this and thanks in advance.....