I sympathize with the tension. These are the big questions I still had after reading your site docs. Thanks for taking the time to answer them! We use RSpec, C

I sympathize with the tension. These are the big questions I still had after reading your site docs. Thanks for taking the time to answer them! We use RSpec, Capybara, Selenium, Chrome Driver. We parallelize our tests semi-manually, which is a minor inconvenience. Recently moved to GitHub Actions, which makes it easy to cache dependencies (mostly gems), although it's not quite a pre-built image. Startup cost with fully warmed cache is about 55 seconds, almost all of which appears to be spinning up the container. Not sure what the underlying tech is, but that seems slow.