Puma, Falcon or Pitchfork? Choosing a Rails App Server in 2026

A practical comparison of Puma 8.0, Pitchfork 0.18 and Falcon 0.57 for Rails on Ruby 4.0: concurrency models (threads vs forked processes vs fibers), what changed in each server this year, production configs for all three, a comparison table, how to measure GVL wait before switching, and a decision guide by workload. Also available in pt-BR.