Bump. This feature is essential for Roblox games that want real-time communication with web services. Roblox servers acting as a WebSocket client (for connecting to the web service(s) required) and server (for connecting to the players in the game server) may pull down performance a little, but still, long-polling places a lot more stress on our servers hosted on the Web (which uses up resources) and WebSockets are known to just be more lightweight and faster than HTTP TCP requests.
*Reviving the topic here!
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