Ruby is fucking slow it is unbelievable. Their self-righteous author Matz is such a prick that he didn't bother reading anything on how to make a language. So he shat one out in the simplest way he knew how. This results in a language which often TCL will beat. TCL passes code as strings. Ruby has a hard time beating TCL. That's nuts.
Try coding some numerical code in ruby that runs in O(n^2) and verify it actually works with test cases. Your development time has just sky rocketed waiting for your horribly shallow unit tests to finish fucking type checking. Language performance effects programmer performance, if your language is slow, you won't do things which are slow and valuable, in fact you'll try to avoid them because you know what will happen, you'll have to code in C. But since you're a ruby zealot you obviously don't know C very well thus that scares you.
Ruby is incredibly slow. Code density does not imply maintainability either. Even if you follow the idiotic ruby way. 5 levels of deep of dot operators simple code does not make.