There have been a lot of issues with the iPhone 4 and 4S of late since users installed the new iOS 7, we do not need to go into all these problems again because we have reported many of them since the new operating system released. The main problem is performance..Here is the trick to improve performance iPhone 4 and 4S with iOS7
Go to Settings -> i Cloud -> Documents & Data
Then just Off the Documents & Data
Then you can observe the performance.
