iOS 9 Beta Performance
Users in Apple's beta program have been providing feedback regarding the iOS 9 beta and at this point, it looks like the iOS 9 beta is as stable as it has ever been.
One user recently told us that iOS 9 beta 5, Apple's latest beta, is performing quite well on older devices like the iPhone 5s and iPhone 4s. We've also heard from trusted sources that the iOS 9 beta 5 is doing great on the iPhone 6 and iPhone 6 Plus.
Point is, if you've been interested in trying out the iOS 9 update ahead of its release date, now might be a good time to do so. There is the paid developer account route and there's also a public Beta Software Program that's free of charge provided you have a Apple ID.