1. makes sense, our app is limited locally because docker on mac is not fast

2. Our test suite is pretty good! It's limited by the longest test runs (basically selenium tests that are slow because browser interactions are slow), circleCI allows pretty easy parallel testing

3. I think the same reason we offload long-running rails processes still applies . The only thing a long running rails request blocks is further requests to that particular thread handling the long request. Usually some other request will end up getting queued to that thread which is the issue. So it's a load balancing issue, as well as a UX issue (you don't want an HTTP request to take 3 mins loading a long report). Unless Elixir can indefinitely spin up new threads, this is still a load balancing issue, determining which server incoming requests are routed to

We don't use action cable so I can't comment there