Q:Why is my iPhone 5S running slow.
GD: iPhone 5S is fastest smartphone from Apple. It runs much faster than its competitors Samsung Galaxy S4 or Nexus 4 2nd Generation. If you have iPhone 5S with this problem, you can fix it. How?
Step 1: Close running Apps on iPhone 5S (iOS 7)
The first thing to try is to purge your most recent apps from memory. The iPhone 5S multitasks by suspending applications that are no longer active, but allowing a portion of the application to keep running.
To close the application, we need to get to your task bar. You can do this by double clicking the home button at the bottom of your iPhone 5S. When you press it twice in quick succession, a task bar will come up showing your most recently used apps.
Step 2: Reboot iPhone 5S
Sometimes closing down apps simply won’t do the trick. In this case, rebooting the iPad is the best recourse. To reboot the iPhone 5S, hold down the sleep/wake button button until instructions appear telling you to slide a button to power off the iPhone 5S. After the iPhone 5S’s screen goes completely dark, it is powered down and you can start it back up again by holding down the sleep/wake button again.