iPhone RAM Clear

There is a much quicker way to free up a slow iPhone's memory than rebooting or closing lots of applications. Just press and hold the power off button until you see the "slide to power off" screen below, then press and hold the Home button until the main screen reappears.

http://www.cio.com/article/3012130/ios/clear-your-ios-devices-ram-in-10-seconds.html