So how much will your performance suffer if you upgrade from iOS 9.2 to iOS 9.3 Beta 1? Not too much, as long as you’re on an iPhone 6.
As you can see, an iPhone 6 running iOS 9.2 is barely faster than an iPhone 6 running iOS 9.3:
Things get slower, though, when you upgrade to iOS 9.3 beta 1 on an iPhone 5s:
It’s even worse on an iPhone 5:
And god help you if you’re still on an iPhone 4s:
Worth keeping in mind is that performance tends to improve during beta releases, so these slowdowns are likely to decrease. Either way, though, one thing will likely be true regardless: the newer your device, the less iOS 9.3 will effect your performance.
Via: Redmond Pie