[millioncents]

At the bottom of the article they have "methodology" link, which explains how the test was performed and how you can replicate the tests yourself. https://ninefold.com/performance-method/

[rubiquity]

There's still nothing there about making your Rails apps perform better. That link just shows how to create an app on Heroku and hit it with flood.io traffic.

[disbelief]

That's methodology for the tests, not methodology for mailing a Rails app perform better.