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For reference when you say "pretty good-sized load" what are you referring to?

Thus far, peak at about 3000 REST requests per minute and 400 simultaneous ActionCable (websocket) connections. We're still scaling up the app, as we just launched it about a week ago, but we haven't yet hit the limits of the platform.

How many dynos does it take to serve that up, just out of curiousity?

Actually just 1 Performance-M dyno. With Sidekiq for external/resource-intensive requests, and a pretty large pool configured in Passenger.

ETA: It doesn't get as much press, but ActiveJob is one of my favorite parts of Rails 5. It's an agnostic implementation of background jobs -- ActiveRecord : (Postgres, Mysql, etc) :: ActiveJob : (Sidekiq, Resque, etc). Very nice, flexible syntax and it helps make your application platform-agnostic.

Second ETA: As rapind pointed out, ActiveJob has actually been available since Rails 4.2.

I think ActiveJob has been in there since 4.1 or 4.2. Agree it's nice to have a standard.

one would hope 50 REST requests per second would not be the limit of the platform.

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