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So why would I pick Crystal over Scala or F#? Crystal used to be targeted very specifically at Ruby fans; if it's diverging further from Ruby and becoming just another modern typed language, what's its USP compared to the established languages in that space?

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neither scala nor f# are c speed.

They're pretty close; I'd be amazed if Crystal were any faster (it's also GCed, right?).

It's probably faster.

I was looking at https://www.techempower.com/benchmarks/#section=data-r11&hw=... today for unrelated reasons. Crystal does better than I'd expected, but less well than Scala (Spray being the comparison I'm interested in since that's what I use); F# doesn't seem to have been tested.

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