Have a look here: https://www.dslreports.com/faq/17944 if you want decent speed tests you have to disable any ad blockers in my case uBlock Origin.
I did see that, Ran adw cleaner " hmp.alert KIS quick scan Trend Micro HouseCall "full scan" This was with KIS adblocker on WIFI my wife 100 down 40 up I pad 139 " 40 " ASUS RT AC68U