I've seen several posts complaining about slow internet connections when using the T2U product.  I tried downloading the latest driver from the tp-link site with no success (2020 date).  The problem was fixed in the following manner in my case:

- go to Device Manager in Settings

- go to Network Adapters and click on the Tp-Link product involved

- select Driver on the top menu bar

- select Update Driver and follow any instructions

The driver involved must be part of the Windows operating system but worked great.  This driver publish date is 10/14/2024.....4 years newer.  The T2U connection speed is now at full speed, not half as before!

Hope this helps someone.