Really intresting clojure and clojurescript seems to be wonderfully designed and with the advancements that's going to take place in jvm I hope it can be as good at performance as java or Go.
It is by default slower than Java and Go because the default data structures are immutable. When execution speed is more important than statelessness you can make your data structures mutable.
Read more about that here http://clojure.org/transients
Happy holidays :)