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Speed up your test suite by throwing computers at it

You've probably experienced this. CI times slowly creep up over time and now it takes 20, 30, 40 minutes to run your suite. Multi-hour runs are not uncommon.

All of a sudden, all you're doing is waiting for CI all day, trying to context switch between different PRs. And then, a flaky test hits, and you start waiting all over again.

It doesn't have to be like this. In this talk I'll cover several strategies for improving your CI times by making computers work harder for you, instead of having to painstakingly rewrite your tests.

RailsConf 2021