What frameworks / technologies to use in web applications for Real Time features?

What do you recommend (or not) to use for Real Time features (like chats or auctions) in web applications?

The most important for me is your opinion or benchmarks about the efficiency / performance / speed of specific frameworks, technologies and solutions.

For example:

• Ruby on Rails + ActionCable
• Phoenix + Elixir
• Socket.io

QUESTION'S CONTEXT:

Each framework, programming language, technology has some advantages and disadvantages which make it more or less effective for Real Time needs. Sometimes we can use multiple technologies to build app's backend, for example when backend is a set of cooperating services (SOA, micorservices, etc.). Due to both, we are able create some features in Ruby on Rails (because the implementation is fast) and other in Java (beacuse it works fast).

via nicq