The pessimist in me thinks that iOS 11 beta 5 will not be as big of an improvement in performance/stability that people here are hoping for in 8 and a half hours. Beta 4 had a lock screen dimming issue, messages third party keyboard lag and animation lags when just doing some scrolling around in the OS on my 7+, just to name a few bugs that are a big reminder that you are running a very unpolished beta. Those minor things get really annoying when you have to deal with him dozens of times a day.