A look at L4S, an internet standard finalized in January 2023, aiming to reduce latency, with interest from Apple, Google, Comcast, Nvidia, and other companies
A few months ago, I downgraded my internet, going from a 900Mbps plan to a 200Mbps one. Now, I find that websites can sometimes … Threads: @ezra and @richardlawler . Mastodon: @jay@cuthrell.com X: @thowland , @jlivingood , and @rjcc . Forums: Hacker News Threads: Ezra Mechaber / @ezra : @reckless1280 I read this piece and Mitchell's excellent “boil it down” paragraph, and all I could think about was that maybe 5g + L4S means we can finally do surgery on a grape. https://www.theverge.com/... Richard Lawler / @richardlawler : Tech Threads Slow, laggy Internet is almost never about bandwidth — the problem is latency, which hasn't improved much since the dial-up era. But there's a fix, and it's coming your way very soon. Three letters, L4S, are going to change web browsing, gaming, video chatting... everything and it starts next year. @maple_plants can explain better than I ever could: https://www.theverge.com/... Mastodon: Jay Cuthrell / @jay@cuthrell.com : @Techmeme One thing rarely discussed with return to office ambitions is how phenomenally awful the in office workplace connectivity experience can be. — To acronym this out a bit... If getting wider availability for L4S on CE comes before LLD, the OMG moment will be for those that RTO and perhaps the tide will shift due to FOMO. … X: Tim Howland / @thowland : @verge is it “Turn off Javascript”? Jason Livingood / @jlivingood : Really great quality, in depth reporting by the @verge team and Mitchell Clark on latency, buffer bloat, and L4S!! Very accessible for the average reader and explains things well. #L4S #LowLatency #Latency #AQM #Bufferbloat Richard Lawler / @rjcc : Slow, laggy Internet is almost never about bandwidth — the problem is latency, which hasn't improved much in years. But there's a fix, and it's coming soon. Three letters, L4S, are going to change web browsing, gaming, video chatting... everything. https://www.theverge.com/... Forums: Hacker News : What Is L4S?
Context & Ripple Effects
L4S shifts the broadband conversation from headline download speeds to responsiveness under load. The standard’s importance rests on whether network operators and application platforms implement it together, not on any one company’s stated interest.
That implementation path later became concrete: Comcast began a select-city ultra-low-lag rollout using L4S, followed by T-Mobile’s plan to extend L4S support on its network. Those moves make this early industry interest a useful marker of how latency became a network product feature.
First-order effects
- Apple, Google, Comcast, Nvidia, and other interested parties gain a common technical basis for prioritizing low-delay traffic, rather than treating more bandwidth as the sole remedy for sluggish interactions.
- For users, benefits depend on L4S-capable access networks and endpoints; the standard alone does not change the latency of an existing connection.
Second-order effects
- Broadband and mobile operators that deploy L4S can differentiate on lag and consistency, not just advertised throughput—an approach reflected in Comcast’s later low-lag connectivity offering.
- Application and device providers have greater reason to optimize interactive services around lower queueing delay, while operators face pressure to make support interoperable across fixed and mobile networks.
Third-order effects
- If deployment broadens, latency can become a separately marketed and managed quality dimension of connectivity, shifting competition toward performance under congestion rather than peak-speed claims.
- The limiting factor becomes cross-network adoption: uneven support could make low-latency performance dependent on a user’s operator and application path, rather than a universal internet property.
The trend: L4S is part of a shift from selling bandwidth alone toward treating predictable low latency as a differentiated network service.