User:Lenoxus/coaxial

I learned that number in my textbook Guide to Networking Essentials by Gregory Tomsho. It says that coaxial cables used to be used in Ethernet physical bus topologies but they've been superseded in part because of that slow speed. But the same paragraph also states that coaxial cables are used as "the network medium for Internet access via cable modem". I was under the impression that most high-speed Internet service was cable-based, but 10 MBps does not seem high-speed to me, so how does this work?