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"... and date library were reimplemented in C" Is this merge of https://github.com/jeremyevans/home_run ?

Nope. It was a new implementation by Tadayoshi Funaba (the ruby Date maintainer), but it uses a similar data structure to home_run, and performs about as well.

Not sure, but it's a lot faster either way:

https://gist.github.com/1117138

That's an impressive speed boost.

How much of the Ruby stdlib is implemented in C?

I'd be interested to see how a better-implemented, properly optimized pure-Ruby version would perform.

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