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I wonder how much of this is due to them using Crystal for the backend.

I wouldn't be surprised it make huge difference. I would like to point to [1] compmike's comment. You get 80% Ruby along with Types benefit plus many Times the RUNTIME speed improvement.

[1] https://news.ycombinator.com/item?id=32216786

It's a general purpose programming language like any other mainstream language.

Being a statically typed variant of Ruby, it’s well suited for fast development without making a mess.

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