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Probably majority of difference involved various kinds of history downloads (like with Matrix). There's nothing special when it comes to base WebSockets-over-TLS vs XMPP, except that there's a possibility that the Websockets-based sytem is more efficient (XMPP has pretty big overhead)

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WebSockets is just another transport method, by itself it is not going to be very different from plain old TCP/TLS sockets. Other things are going to matter more, like how 'chatty' the protocol is, especially while you are not actively sending messages. XMPP has historically been quite chatty while idle, but todays modern XMPP servers know to optimize traffic so that your phone can sleep undisturbed in your pocket until something important like a message or a call comes in.

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