L4S pulls this off by giving internet packets an indicator that lets them know if they’ve run into congestion or queueing along any of the hops in their trip between a user and whatever they’re connecting to. If there is a delay, then the devices can start to adjust to stop making the congestion worse — and possibly eliminate it entirely.

Comcast Introduces Nation’s First Ultra-Low Lag Xfinity Internet Experience with Apple, Meta, NVIDIA, and Valve

Jason Livingood, vice president of technology policy, product and standards at Comcast, told VentureBeat that they believe they can cut lag down from hundreds of milliseconds

Laggy internet might be a thing of the past, at least for Comcast customers. In a press release today, the company introduced what it calls a first in the nation -- ultra-low-latency internet designed for gaming, videoconferencing, and virtual reality. The technology has been in testing since 2023.

Comcast is rolling out DOCSIS with L4S and is specifically calling out the low-latency capability as a differentiator for its Xfinity Internet services.

Comcast has announced new technology for ultra-low lag Internet on its Xfinity service. According to the company's release, users of select products and software from its partners will experience less delay in situations with bi-directional traffic.

Comcast has announced its first ultra-low lag Xfinity Internet experience, lowering the latency for gaming, videoconferencing, virtual reality, and many more.