Rails boot times suck. Waiting between 5 and 25 seconds to restart a server, run a test or to open the Rails console just doesn't cut it. When doing TDD, you *need* the shortest feedback cycle possible.
Performance patched Ruby installs give you a significant improvement, and with Ruby 2.0, the require path is much faster than it used to be. These improvements are great, but we can still do more.
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