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Factories in Ruby testing are slow because they create cascading associated records, while fixtures load data once and use transactions. FixtureBot is a new gem that combines factory-style syntax with fixture performance by generating YAML fixtures from factory definitions. For parallelism, RSpec lacks built-in support but can use parallel_rspec gem, while the sus gem offers RSpec-like syntax with native parallel execution. This approach maintains readable, human-friendly test code while achieving the speed benefits of fixtures and parallel test execution.

Don't throw the specs out with the factories

Will RSpec ever support parallelism out of the box?