Enter SETTINGS>SAFARI

Here you will find CLEAR HISTORY & CLEAR COOKIES AND DATA.

By clearing history, it will close all current browsing pages that you have open. Please save any unfinished work or bookmark pages that you do not want to lose BEFORE you click CLEAR HISTORY.

As the photo says, cookies and data helps speed up browsing, but it can also slow down your system by caching temporary files. Personally, I clear this weekly as regular maintenance.

Press and hold down one of the app icons for two (2) seconds. The apps will start to wiggle and have a red minus sign on the left corner. Press the minus sign to shut down the app.

On another note, if an app isn't working properly, try closing it using this method and re-opening it again. Sometimes it just needs a restart.

Another tip I found to be beneficial is reducing the frequency that iOS checks for mail. You can find this in SETTINGS>MAIL,CONTACTS,CALENDARS

Scroll down to find the FETCH NEW DATA option. From here, you can reduce the time that your system checks for new mail. This also helps reduce battery drain.