fromAtoB Blog Speeding up Rails boot time

Usually when we have a small Rails application, or are starting a new project, we don't have such a problem as slow boot time. At this point our app is using just a few libraries, logic has not evolved into a big monster, not many feature/integration tests... easy peasy!!! But then comes the day when you dread doing a change on your codebase. A single small change means an endless waiting time to boot the web app or to run a single unit test.