For most scaled up examples in Erlang and Elixir, there is a BEAM process (green thread) per connection as well as others (usually arranged as a supervised pool

For most scaled up examples in Erlang and Elixir, there is a BEAM process (green thread) per connection as well as others (usually arranged as a supervised pool so one can avoid an acceptor bottleneck). There are a few reasons it does better but the biggest is a carefully tuned SMP scheduling mechanism and aggressive preemption policies. Some of these choices actually hurt throughput in favor of fairness and latency. All in the name of reliability over speed.