[vlasky]

For real-time webapps when you need minimum latency updates, Meteor is a dream. IoT, GPS tracking, messaging apps and stockmarket trading apps are all well suited to being implemented in Meteor.

DDP is a simple protocol that runs on top of WebSockets, which runs over TCP. Back in 2013, someone achieved 12 million concurrent WebSocket connections on a commodity server. There is no reason why Meteor should not be able to handle a comparable number:

https://mrotaru.wordpress.com/2013/10/10/scaling-to-12-milli...

Meteor fully supports the NPM ecosystem. Meteor does not have to always use DDP. You can implement RESTful APIs and serve static pages using the many router packages available.