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 communicate, making actor-style architectures far more practical.
This article explains what changed, why it matters, and when you should actually consider using it.
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