Your iOS device is designed to deliver efficient use out of the box. If you notice slowed performance or battery drain, check out these areas.
SOFTWARE UPDATE Keep your operating system and apps up-to-date for best performance and security. You can find operating system update info under General in Settings. Check for App updates in the App Store under Updates or turn on Automatic Downloads for Apps by going iTunes & App Store under Settings.
AIRPLANE MODE If you are trying to preserve battery power until recharging, turn on Airplane Control in Settings. This will eliminate background apps and data usage, increasing battery life and performance.
STORAGE If your performance seems to slow, the first thing to check is the storage availability. If it dips below 1GB, you may notice some performance issues. Go to General under Settings and check Usage. Open Manage Storage to learn what apps use the most storage and to decide what apps, if any, to delete. Two other quick ways to increase storage space is by eliminating old messages and freeing up photo space.
Eliminate Old Messages – You can free up storage by setting your messages to expire after 30 days or 1 year. Go to Messages under Settings and make adjustments under keep messages.
Photo – Reduce your photo storage in several ways. In the Photo app, turn HDR to Auto. Under Photos & Camera, turn off Keep Normal Photo. Now you will only save the best shot. Turn off iPhoto Cloud Library and use Google+ to store photos online (it’s faster than iPhoto Cloud and it’s free).
REDUCE BACKGROUND ACTIVITY If you need to conserve battery drain, you can limit background activity by adjusting Share My Location and Background App Refresh. Under Privacy in Settings, you can completely turn off Share My Location or you can turn off this service for certain apps. Go to General under Settings to turn off all or some permissions in Background App Refresh.
REDUCE MOTION Turn off the motion effects in the home screen and in some other parts of the system to speed performance and reduce battery drain. Switch this off by looking under Settings, General, Accessibility, and Reduce Motion.