[wenbo]

Supabase dev and the maintainer of Supabase Realtime here!

Meteor was before my time (I was doing product when Meteor was all the rage back in the day and never had a chance to explore it as a dev) so can't speak to that but Realtime scales pretty well since it's an Elixir/Phoenix server listening to a Postgres database.

We've recently added Realtime RLS, a more secure version of Realtime, so we need to continue to tune it to make it more performant. I think a couple hundred is doable for now. You should give it a try and give us feedback.

We have a Supabase user who is running the version prior to Realtime RLS, which is more performant at the expense of security, and they have thousands of users chatting concurrently. Just to clarify these chat messages are being saved to a database and then being broadcast to thousands of users.

We're also actively working on Realtime Broadcast which doesn't need to go through the database. Great for ephemeral chat messages and definitely more performant.