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The best benchmark I've seen is this one
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SaaSHub
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I just tried to get crystalline working, and it seems to be working surprisingly well. Performance is and always will be an issue with LSP for Crystal, though. Crystal by its nature compiles slowly. Although, perhaps this will be helped by the new "interpreted" mode?
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Here is a similar benchmark but includes compile times. https://github.com/drujensen/fib
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