SAN FRANCISCO  Comcast, the country’s largest residential Internet provider, said on Thursday that it would take a more equitable approach toward managing the ever-expanding flow of Web traffic on its network.

The cable company, based in Philadelphia, has been under relentless pressure from the Federal Communications Commission and public interest groups after media reports last year that it was blocking some Internet traffic of customers who used online software based on the popular peer-to-peer BitTorrent protocol.

Comcast said it would change its fundamental approach to playing Internet traffic cop. Instead of interfering with specific online applications, it will manage traffic by slowing the Internet speeds of its most bandwidth-hogging users when traffic is busiest.

“In the event of congestion, the half percent of people who are overutilizing an excessive amount of capacity will be slowed down subtly until capacity is restored,” the chief technology officer for Comcast, Tony G. Werner, said. “For the other 99.5 percent, their performance will be maintained exactly as they expect it.”