Check out the 9.1 Beta 2, it's really smooth, and battery life is amazing. Haven't had one crash yet, and no reloads what so ever. It's in Apples website, you register your device, and they download the profile to your device, it runs like a regular OS update, and that's it. Under 5 mins and you'll have a better experience. What's really good, is that you can always roll back to iOS 9.0.1 if you wanted. Just make sure you do a back up, with that profile OS, or else it'll tell you, that you have a higher (current) version already. Then you'll need to do a full restore. So make sure it's definitely backed up with your current OS, before making any changes.