Don't Install iOS 9.1 Beta If You Hate Dealing with Problems
If you don't like dealing with bugs and other issues, and you're getting solid performance out of your current iOS update, our advice is to wait for the public iOS 9.1 release date in October or November.
iOS 9.1 beta might improve your performance but there's a good chance it will hurt your device in other areas. Developers have discovered a number of annoying bugs including control center lag, issues with iPhone 6s 3D Touch latency, and problems with AirPlay.
Don't download the beta if you don't want to deal with bugs. There's a good chance you'll run into something during your time with it.
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