I've had agents implement and optimize the Campfire web app in Elixir, Go, and Rust.
Yes, Ruby is the slowest. I didn't care about that when the pay-off was huge in terms of productivity and developer joy. But if you're no longer reading the code? https://github.com/basecamp/once-campfire
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@dhh Personally, I think golang is the best middle ground, fast enough and great feedback loop and way easier to navigate its eco-system since its all in one nature. I probably can ship 5x features already, before the Rust finish compiling the bootstrap version...😆