A few beta builds later, things have actually regressed in some areas. As per the latest speed test done by YouTuber iAppleBytes show, the iPhone 5s running iOS 10.3 beta 5 now boots slower when compared to iOS 10.2.1. Only the iPhone 5 and iPhone 6 continue to boot faster on the latest iOS beta, while the 6s boots up at the same speed.
With iOS 10.3 still in beta stage, it is possible that we can see some noticeable improvements when the final build of the OS drops. And even if app loading and boot times don’t improve post the update, the switch to APFS should lead to basic tasks like copy/paste and transferring files between apps taking place at a much faster pace. Thoughts?