I have an iPhone 4s and I didn't even want to update to iOS 7 because my brother did, and his phone really slowed down. Since I need to answer calls or take pho

I have an iPhone 4s and I didn't even want to update to iOS 7 because my brother did, and his phone really slowed down. Since I need to answer calls or take photos fast I really could care-a-less about other features. If my device isn't fast, I lose the moment. iOS 6 forever on this device (baring some big security problem)