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Is there any extra overhead when using D instead of C if I write code to extend interpreted languages?

Maybe D runtime / GC should initialize and exit every time the function is called, so that it doesn’t help to add small do-very-little functions like string to lower, urlencode, etc. I don't know how this works, but I wrote several extensions in C.

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Yes, the D runtime should be initialized when the D program starts, and (depending on which libraries you use), static constructors must be called. This is minimal, but as you said, it would be inefficient for small functions.

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