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So this happens with Safari on iOS 11? If you hit a webpage other than Aerohive AUP, it's zippy? If you try Chrome instead of Safari, it's zippy? If it's an Aerohive login page instead of an AUP, it's zippy? This happens with all iOS 11 users, one iOS 11 user, or there is only one iOS user? What do your Aerohive debugs show you run against the iOS 11 mac address?
That seems pretty strange that only some iOS users are having the problem. If you backup the phone to the cloud and test without any configuration/apps on it, is the problem seen? Then if you start adding apps, etc., when does it break?