runtime performance for web requests absolutely demolishes rails. its not even close. I was seeing sub 10ms response times in developer mode. database queries end up being the overwhelming botteneck,

Then there's realtime. phoenix channels is the standard. everything else is a janky copy thats issing one or more factors that make it so good. elixir users lightweight threads so there's less overhead per connection which means you can run WAY more connections on a single machine. Live view takes this further but allocating a persistent process per user on which state can be synced to the frontend without writing ay javascript.

ruby on rails has more and better gems when your'e starting out but once you get some traction, maintenance on an elixir app is much easier due to it being functional.