Reduction in WIFI speed in iOS 11.3 beta 6

Actually I think this started in beta 5 but definitely now in iOS 11.3 beta 6. Starting with this update experiencing a drastic reduction in WIFI speed We have Cox so our hard wired speed is 1,007 in average but occasionally I’ll get a 997. That’s nothing really. Through WIFI my iPhone X and both iPad Pro models average 475. Even my iPad mini 4 which is not new at all 365 average. Not bad for an older device. But after beta 6 (possible beta 5) I can’t crack 20. THATS drastic. I’ve tried all the usual tricks (reset Network, reset modem, have Cox come out check the line, General- > reset networks settings, hard restart iPhone X) and nothing fixes it. Nothing. So I deduced the ultimate test would be to install the beta on my perfectly functioning iPad mini. Not only did it take 11 attempts to “find the internet” period, when it did? You guessed it: I couldn’t get to 20. Fortunately it has my previous s results to prove I wasn’t high on acid and imagined all of this. In fact my iPhone X previous results also show these 400+ results prior to beta 6 (possibly beta 5) Is anyone else getting this happening to them? I thought maybe it was an “iPhone X only” issue until I installed it on my mini. Now it’s a “beta 6” issue for sure