Need for Speed on Internet Emerges as Comcast Deal Test

The question of what counts as high-speed Internet service is emerging as a sticking point in Comcast Corp.’s bid to buy Time Warner Cable Inc.

A top federal regulator has proposed a definition that would leave the company with as many as half of U.S. broadband customers -- too much for some critics. Comcast wants to include homes with older, slower service, leaving its market share at little more than a third.