[jonstjohn]

I've experimented with running headless tests using Firefox, in hopes of getting a good performance boost in terms of test speed. The results actually did not indicate much of a difference. If anything, FF in headless mode on CentOS ran slower than on Windows.

That's not to say there aren't good use cases for running headless browsers with Selenium. One huge benefit is not needing to run Windows VMs.

[iamchrisle]

Nice. I would add that Selenium performance isn't super awesome but if you only need to use it for a specific set of integration tests it's OK. You can use something like PhantomJS to speed through the rest your tests that don't specifically need exact browser implementations.