Does this happen to anyone else? I have experienced this issue on the iPhone 4, 5 and 6+ through various versions of iOS. Quite frequently a webpage will stall or hang when the blue bar is approx 1/7th of the way across. I could leave it for an hour and it would get no further, however force-closing the app and reopening Safari will cure the issue for a while. It happens with no other browser on the same phones, so is purely a Safari issue. I just live with it as I can see no way of ever fixing it, unless of course Apple cure whatever the bug is. I can't see how this could only be affecting me as it has happened on numerous iPhones now over a good number of years.