By using a utility called Iperf (free to download), you can find out the speed between two locations.
Download the Iperf utility on both servers (local and remote). One will act as the server; the other will be the sender.
On the server, run iperf with the following command:
C:\iperf3 -s
This will start a listener on the local server in the command prompt window.
On the remote server, run iperf with the following command:
c:\iperf3 -c xxx.xxx.xxx.xxx -P 20
(x is the IP of the local server)
The -P 20 command will fully saturate the line showing the true speed between the two sites
To find out more commands that the iperf command can do, run the following command:
c:\iperf3 /?