iOs 7 makes your iPhone 4 very slow : how to (try) to solve it

Hi surfers, it happens again. Every release of iOs run great on the last iPhone but makes previus iPhone very slow (or maybe, this is that i read on internet, because i don’t have an iPhone). This time users says that iOs 7 on iPhone4 make the smartphone SLOOOOOOOOOW, 15 seconds to open keyboard and battery overload. You want to downgrade to iOs 6? you can’t 🙁 so, how to solve the problem? simply disable “documents and data sync” in the iCloud. This will solve keyboard lag.