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Re:Use Phoenix Channels by ch4s3 on Wednesday August 04, 2021 @12:11PM (#28062721)
This podcast episode[1] is about exactly this, scaling live chat to a few 100k users, on a small number of machines in a real word scenario where the users are all signing on in a short time span to live screen a film and chat about it.

[1] https://thinkingelixir.com/podcast-episodes/057-scaling-live...

Re:Use Phoenix Channels by aloukissas on Wednesday August 04, 2021 @12:14PM (#28062758)
I also went on the same podcast (Mark + co are great hosts!) and talked about some of the challenges of scaling in the real world: https://thinkingelixir.com/podcast-episodes/051-live-auction...