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Last time I looked Crystal's string handling was significantly slower than Ruby's.

In a pre 1.0 language there will always be some things that are still waiting to be optimized. I saw some performance spec for one of their HTTP libraries awhile back and it was a lot faster than Ruby. It might have been faster than Go.

It was faster than everything, and by a huge margin: https://github.com/costajob/app-servers#results

It does seem that immature languages tend to win a lot of benchmarks, likely because they're still cutting a lot of corners. Still, though.

I only wish they picked a more "Enterprise-friendly" name...

Well, it is the only LLVM language on the list. Even so, Nim transpiles to C and should be fairly comparable unless it is because of the async part or like you said they're cutting corners. I guess it's possible they're just that good, but it seems unlikely.

Please stop using the word transpiles in this context. Nim compiles to C.

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