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Crystal-lang has also been around with similar ruby syntax and features like green threads, and a larger standard library. Performance is at par with golang.

http://crystal-lang.org

PS: Notably, websocket support is still lacking in Goby.

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Crystal is closer to C performance wise. The compiler is much slower than Go due to the aggresive type inference.

I believe this is partially due to the lack of incremental compilation, which is on the roadmap [0] for 1.0. The compiler itself builds in ~10 seconds. [1]

[0]: https://github.com/crystal-lang/crystal/wiki/Roadmap

[1]: https://crystal-lang.org/2015/12/24/the-future-of-crystal.ht...

at first glance it appears that goby runs on windows, which is pretty handy.

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