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Immediately after installing the Windows 10 version 1703 Creator's Update (CU), wifi speeds are very slow. Checking the speed on speedtest I was getting 2-7 Mbps download when I normally get 50-80 Mbps. Searching shows many with the same issue after updating to CU, but few if any solid answers.
Checking another Windows 10 machine without CU gave normal internet speeds so I ruled out the router or any temporary internet speed issue.
I'm using the following USB wifi adapter:
TP-LINK Archer T4U (version 2.0)
I tried downloading the latest driver from TP-LINK and installing but windows just says "The best driver software is already installed".
I got this problem yesterday - I suddenly went from 120Mbps to about 1.6 Mbps.. Really hope that this will fix it. – Stender – 2018-05-04T10:21:36.080