I read that a Pleroma instance can handle at least 10-50x the traffic of a Mastodon instance running on the same hardware. Based on the reports from other sites that have switched from Ruby to Elixir, this claim rings true. Are you claiming otherwise? I mean, the lack of a GIL alone (thank you, functional language with immutable data!) should give a pretty massive performance improvement
As someone who has extensive experience in both elixir and ruby, and mastodon itself, no this is doesn't.