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The Rails Tech Debt Blog ➜ From 40 Minutes to 4 with Tests Parallelization https://www.fastruby.io/blog/speed-up-tests-from-40-to-4-minutes.html

www.fastruby.io

From 40 Minutes to 4 With Tests Parallelization - FastRuby.io | Rails Upgrade Service

How we cut a test suite time from 40 minutes to 4 by upgrading Ruby/Rails, fixing slow tests, and enabling parallelization, dramatically improving developer experience and CI costs.

fastruby.io
12:25 AM · Mar 3, 2026