Ran a little slow on my 7 plus so I left it overnight (UK here). This morning there was still a delay when opening apps, but I discovered that if I clear all apps from the app switcher, performance hikes up to very good levels. No lag noticeable. Only had to do this once and it's screaming now.
Just remember if you have a watch and you upgrade that to WatchOS 4, you are seriously unlikely to be able to restore your phone back to 10 and the watch still function properly. Ensure you're happy for "no going back" if you install iOS 11 beta and then WatchOS 4 beta.
Just remember if you have a watch and you upgrade that to WatchOS 4, you are seriously unlikely to be able to restore your phone back to 10 and the watch still function properly. Ensure you're happy for "no going back" if you install iOS 11 beta and then WatchOS 4 beta.