Waiting over an hour for a test suite to finish is a productivity killer.

On a recent project, that was Aysan’s reality.

Running the full local RSpec suite took almost 2 hours, making it difficult to get quick feedback and confidently iterate on changes. While there are many ways to optimize test performance including fixtures, request stubbing, faster tooling, and more, most of these options require significant effort to implement.

Instead, Aysan and her team explored a simpler approach: bringing parallel test execution to local development. The result was a much faster feedback loop (down to 5 minutes) and a significantly better developer experience.

More here: How to Parallelize Your RSpec Test Suite Locally