Comcast is increasing the speeds of two of its most popular XFinity Internet speed plans, “Blast!” and “Extreme 50” at no additional cost, the company will announce Tuesday.

The move will allow customers to have twice as fast Internet speeds on multiple devices.

Also for no additional cost, Comcast in April will increase the speed of its widely used Performance plan by more than 60 percent.

To activate the new speeds, customers just need to re-start their cable modems.

“As customer demands and technology evolve, we continue to increase our broadband speeds to deliver the best, fastest and most reliable Internet experience possible for our customers,” said Shannon Dulin, Comcast’s senior manager of government and regulatory affairs. “Whether chatting, surfing, streaming, gaming, skyping or downloading, families will get the superfast, high-performing Internet service they need, with no extra charge.”

Specifically, the Blast! plan is increasing download speeds from up to 25 megabits per second to speeds up to 50 Mbps and upload speeds from up to 4 Mbps to up to 10 Mbps, while Extreme 50 customers will receive download speeds up to 105 Mbps (formerly 50 Mbps) and upload speeds up to 20 Mbps (formerly 15 Mbps). The Performance plan is increasing to speeds up to (20 or 25) Mbps from 15 Mbps downstream and to (4 or 5) Mbps from 2 Mbps upstream. For more information, call 1-800-XFINITY or visit www.comcastcorporation.com.