A little known trick has been tweeted about by an iOS Developer.
Basically by repeatedly tapping one of the software buttons in one of Apples stock apps iOS will clear down its app cache. Which is believed to improve overall performance of iOS devices.
To perform this “trick” launch the App Store, and tap on the featured star button 10 times in quick succession. If you’ve successfully activated the clear down, the AppStore screen will appear to reload, thus indicating the cache has been cleared.
This is also said to resolve issues with app downloads stuck in a limbo state.