Noah is a Ruby Fellow for AppFolio, working on Ruby performance and related tooling. He wrote the book "Rebuilding Rails" about understanding Rails as "really just Ruby."
Six Years of Ruby Performance: A History
Ruby keeps getting faster. And people keep asking, "but how fast is it for Rails?" Rails makes a great way to measure Ruby's speed, and how Ruby has changed version-by-version. Let's look at six years of performance graphs for apps big and small. How fast is 2.6.0? With JIT? How close is Ruby 3x3?