Earlier quoted context omitted.
5 gbps signal rate doesn't give you the full story about actual data transfer rates to important services, but its a start. Ran into this problem with AT&T Fiber (1 gbps) in Houston, Texas
I’ve had both AT&T and Comcast 1gbps and never had any noticeable data transfer issues. A lot of things like Usenet downloads were close to saturating the wire speed, close to 100MB per second. Comcast’s upload speed is abysmal (coaxial), AT&T was symmetrical (FTTH). How could I test this?
fast.com
In my experience these always tell the truth