Iphone with slow performance?
I want to ask why do lately my iphone runs really slow performances? For example, the shutter sounds of camera sounds few seconds after snapping pics. And if I touch an icon of an apps to open the apps, it'll take time for the apps to open, sometimes it return back to home.
Are these problems because of full memory, or something to do with icloud storage, or what?
And how to overcome it?
It might be because of the firmware. I suggest you to update it to the latest firmware. If it is already updated then backup the iPhone and reset it.
If that does not work, then you should try hard reset too.
1.Upgrade Your iPhone to the Latest iOS Version
2.Close All Apps Running in the Background
3.Turn Off Auto App Updates
4.Remove junks from iPhone - PhoneClean. 
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