I compared a "Hello World" Elixir/Cowboy vs Rack/Falcon. Honestly, I'm surprised it's as good as it is. It shows just how far Ruby+Async has come, and this is in comparison to a system that has dedicated it's entire existence to high throughput I/O and parallelism.
Today I'm releasing XRB (github.com/socketry/xrb) a simple template engine for Ruby (and Rails). It's 10-20x faster than ERB, and has a simpler syntax, supporting #{interpolations} and <?r processing_instructions ?> only.
