Parallelizing RSpec and Rails Tests for Faster Development Cycles` We can use the parallel_specs gem to run our RSpec tests in parallel, preparing a separate database for each test environment. This involves installing the required plugin and modifying the `database.yml` file to specify which database to connect to based on an environment variable. We can then create multiple test databases using the `db:test:create` rake task and run our non-Selenium tests in parallel. To take it further, we can use Sauce Labs' SpecStorm plugin to run Selenium tests in true parallel fashion with Selenium Grid or their own Sauce OnDemand service.