Actually we expect, that for typical scenario where the comunication is mainly FROM server TO client, the WebSockets do not offer any better performance than HTTP Streaming (neither for throughput nor for latency). The real advantage of WebSockets arises for bi-directional communication, that is, when you send low latency updates FROM the client to the SERVER.

Anyway, the JavaScript Client library and .NET client library use a communication protocol with Lightstreamer server slightly different. The JS library is based on a private protocol (not documented), while the .NET library is based on the Network protocol for Generic Client , but at the moment it is not ready for WebSockets.