You can easily setup a test to see if your UTP infrastructure is ok. I used to test a specific wall out let that was not giving me the gigbyte speeds I was expecting. I could see the difference in speed clearly when switching between wall outlets.
I am not going into detail. You can read this in the documentation of the tool itself.
I just downloaded the tool on a laptop and a pc and set the PC as the server side and the laptop as the client.
iperf3 -c <ip of server >
//Serveriperf3 -s / iperf3 -s
Usefull links
How to determine a network cable’s maximum speed? – Super User