There’s something to be said about the opportunity costs of learning to code in another language. I only know python so it wasn’t a hard choice for me, lol. I like python because it’s so easy to learn and is also quite expressive. It isn’t the fastest I guess, but it’s still better than php!
Never used cloujurescript before, but from what i can tell the appeal would be to use node.js modules. I have no statistics, but considering the community around node, I would imagine it performs well - perhaps better than what exists for clojure?