Ruby has long balanced developer happiness with safety, but parallel performance has historically been constrained by the Global VM Lock (GVL). Ractors — introduced in Ruby 3 — were the first serious attempt to bring true multicore parallelism to MRI without sacrificing thread safety. With Ruby 4, the introduction of Ractor::Port significantly improves how Ractors … Continue reading 🧵 Ruby 4 Concurrency Gets Real: Understanding Ractor::Port in Practice →