Yeah, I shouldn't have conflated big-data issues with numerical computing. Good catch.
Mostly I was responding to the idea that there is a relationship between dynamic languages and IO bottlenecks. This is certainly often the case in things like web development, where dynamic languages dominate, but under the hood, Julia has relatively little in common with Python/Ruby/JS/PHP/etc, in terms of how it's implemented or, especially, what it's intended to do.
Mostly I was responding to the idea that there is a relationship between dynamic languages and IO bottlenecks. This is certainly often the case in things like web development, where dynamic languages dominate, but under the hood, Julia has relatively little in common with Python/Ruby/JS/PHP/etc, in terms of how it's implemented or, especially, what it's intended to do.