Charter’s Spectrum service has begun a rolling introduction of L4S technology (low latency, low loss, scalable throughput) to support demanding services such as AI, gaming, conference calls, and other services.
The markets announced today are the beginning of a national rollout. They are Dallas–Fort Worth, Texas; Reno, Nevada; Rochester, Minnesota; and St. Louis, Missouri.
“Speed gets you there, but latency determines how it feels once you arrive,” said Charter Executive Vice President, Product Danny Bowman. “Many of today’s most popular applications require real-time responsiveness. This is about eliminating delays so customers can enjoy gaming, working or connecting with family via video in a way that feels immediate.”
Ookla defines L4S — which Spectrum is rolling out — as a technology that enables a network to remain stable under a load “by signaling congestion early, before queues build and delays become noticeable.” The Ookla article from the end of last year said that traditional congestion control needs to see packet loss before signaling a slowdown. That suggests that customers already are likely to be noticing the issue. By contrast, L4S explicit congestion notification (ECN) to warn applications before network users are impacted.
Latency tools like L4S, which Spectrum announced today, are increasingly important. In January 2025, Comcast partnered with Apple, Meta, NVIDIA, and Valve on what the service provider called a ultra-low lag connectivity service.
The Ookla piece adds that latency is becoming a differentiator between operators. That said, while latency wasn’t mentioned in Spectrum’s February announcement of a challenge to the top three mobile carriers, it clearly is part of the big picture.
The February challenge was for new customers. They would receive $1,000 in savings during their first year if they switch their mobile service from AT&T, T-Mobile, or Verizon to Spectrum and take two or more unlimited lines of Spectrum Mobile and transfer their internet service from any provider to Spectrum Internet Advantage or a higher speed tier.
