Short for “Low Latency, Low Loss, Scalable Throughput,” L4S wants to make this internet feel faster— not by upping bandwidth, but by making data transfer more efficient.
Essentially, the idea is to clear the roads for your internet traffic, so it doesn’t take as long to get to or from your house. This should make video chats feel a lot more like sitting across a coffee table with someone, or gaming feel a lot more like sharing a couch with your teammate. In a statement to Lifehacker sister publication CNET, Comcast said that its L4S trials saw working latency reduced by 78%.
How do you use L4S?
Perhaps the biggest issue with L4S is that it requires app developers to support it alongside internet service providers. That means that Comcast’s version is starting with just a few use cases—L4S will work with FaceTime, Nvidia GeForce Now, and supported apps on both Meta Quest headsets and Steam. The latter two companies haven’t exactly published a list of which apps or games work with L4S, but if your next Counter-Strike 2 match feels smoother, that’d be why.
What are the limitations of L4S?
For instance, if you’re on a FaceTime call with Grandma, and Grandma lives in rural Indiana and uses DSL (no personal experience inspiring this example, I promise), no amount of technical wizardry on your end is going to make her connection better.
It’s still early days, but among people using Comcast broadband in the test cities listed above, their interactions with each other might be about to get far smoother. Comcast says it will deploy to “more locations across the country rapidly over the next few months,” while Verizon and Ericsson recently wrapped up a test on using L4S with the former’s 5G network. It’s an optional bonus for now, but the more people adopt L4S as a norm, the more the internet will get smoother for everyone.
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