Those benchmarks are fairly useless, because it doesn't compare idiomatic usage of those languages, but rather the capability of those languages to drop to low-level primitives and libraries.
I did an experiment once, testing out a simple web-service on the JVM and Scala (with Scalatra) yields the same performance as Java (with Jax-RS), while Clojure (with Noir) is only 2x to 3x as slow and JRuby (Sinatra) is only 4x-5x as slow as Java.
I did an experiment once, testing out a simple web-service on the JVM and Scala (with Scalatra) yields the same performance as Java (with Jax-RS), while Clojure (with Noir) is only 2x to 3x as slow and JRuby (Sinatra) is only 4x-5x as slow as Java.