This New trick will make your old iPhone faster and operate smoothly just for a few seconds let’s get down to business.
Open up the App Store app and tap on any of the bottom buttons (Featured, Top Charts, Explore, Search or Updates) ten times.
Your screen will flash white for a few seconds, then go back to the App Store homepage.
This should speed things up for your phone the process clears out the App Store’s cache and makes it reload, getting rid of any frozen updates and temporary files.
It should also fix an issue where your phone may get stuck while updating your apps.
A few other tips for speeding up your phone are to reset it every so often (press and hold the home and power buttons together until your phone turns off then back on again), deleting unused apps and turning off Background App Refresh (go to Settings > General > Background App Refresh).
Note: This also works for iTunes app store