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It's just latency to the server + the server not being designed for concurrent traffic. Ruby is inherently slower than many interpreted languages, but its combination of power and readability sets it apart, IMHO.

λ time ruby -e0

real 0m0.004s user 0m0.002s sys 0m0.001s

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Your shell prompt is a lambda? I wasn't aware that was possible with most terminal emulators.

zsh on OSX can do it.

Not only there, but zsh in urxvt on Arch Linux is able to do it too - I guess it's a general feature of zsh, then?

I don't think it has to do with the shell. It should only depend on whether your terminal emulator can handle unicode. I'm using Bash on OSX in this screenshot, but it was easy to switch: http://cl.ly/Ab4B

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