Atlantic Broadband announced Wednesday that it has increased residential internet speeds and doubled download speeds for its customers in southeastern Connecticut, including those in East Lyme, Montville, New London and Waterford.

The increased speeds automatically took effect at no additional cost to customers, the company said in a news release.

The improvements in service will enable customers “to surf, stream, download, work and game online at the same time, with greatly enhanced reliability and productivity,” the company said.

“We know how important internet is to our customers’ daily lives, so we’re excited to offer even more powerful internet with significantly faster speeds at no additional cost,” said Chap Hanley, Atlantic Broadband’s vice president and general manager in Connecticut.

Atlantic Broadband also launched a new “Extreme” internet package with download speeds up to 400 megabits per second.