Quite disappointed with iOS 10.3.1. Many people told me that update to the latest iOS system would make iPhone smoother and faster, and free up extra GB space at the same time. I am using iPhone 6 (16GB), and upgrade to iOS 10.3.1 recently, the result is my iPhone becomes so slow, and just free...

Hi, So i've been having this problem for almost two weeks now and i have no idea what i installed or changed on my tweaks i haven't installed any app or somewhat. By the way the lag occurs (I think) after using a lot of apps like twitter/reddit app/ or messenger at first 10 minutes unlocking...