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Good post with some great details. I hope the holdouts on Ruby 1.8.7 REE look carefully at upgrading.

Rails 3.X is still a tough upgrade though. I'd be curious to see similar benchmarks with upgrading a large code base. I've heard a few stories of abandoned upgrades because of the slowness.

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Ruby 1.9.2 was horribly slow when it came to #require. 1.9.3 is a much better release, especially in that regard.

There's also this for even better performance: https://gist.github.com/2113359

Don't forget to set your envvars!

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