1. Close all running apps
Apps consume memory space. When you start an app it’s loaded into the memory. The iPhone 6 and 6 Plus have 1GB memory which is big enough for plenty work, but older phones have even less than that.
And the more apps running, the more memory space is used giving more work for your iPhone to do thereby slowing it down.
Double tap your Home Button to bring up the fast app switcher. Swipe up apps to the to quit them. You can swipe up to 3 apps at the same time.
2. Delete unwanted apps
Delete the apps you don’t need by going to settings, general, usage and then tapping manage storage. You’ll now see a list of apps and how much space they are taking up on your phone. You should aim to have at least 1GB space left, so delete any apps you don’t need by tapping on it, and then tapping delete app.
3. Restart your iphone
You don’t have to do this very often but you should do it.
Restarting your iPhone clears out the memory space and can often fix misbehaving applications.
To restart, press and hold the Sleep Button until the power off slider appears. Slide to the right and wait for your iPhone to go off. Power it on again by pressing the same sleep button till the apple logo appears. Once it’s on, your iPhone will now work freshly.
4. Reduce visual effects
Motion effects add some sightliness to your iPhone but can slow it down too.
To turn off Motion. Tap on Settings >> General >> Accessibility >> Reduce Motion and set Reduce Motion to On. This turns off the parallax effect of icons and alerts on your phone.
You may also reduce transparency effects. To do that, tap on Settings >> General >> Accessibility >> Increase Contrast and set Reduce Transparency to On. This disables the see-through background effects, which speeds up iOS 7 and later. It’s most noticeable in the Control Centre which will now have a solid backgound and should work much faster.
5. Update it’s software
Having the latest software on your iPhone can help your phone run smoothly. It’s always a good thing to frequently check for software updates for your devices.
You can check for software updates from Settings >> General >> Software update to see if there new updates available.
Very soon iOS 10 will be here and you should make arrangements to update your iPhones if they can.