You mean like this guy? https://news.ycombinator.com/item?id=3292555

Scala vs. Clojure is not something to discuss for this use case, I guess. As https://news.ycombinator.com/item?id=3293261 points out in that other thread, you won't write (recognizable) Scala (or Java. Or Clojure) code anymore if you want the best performance.

With respect to the second link: It always helps to know your data structures & their purposes--no matter what language you use, recognizable or not.

With respect to performance: you might want to try writing a c-like solution and run the code distributed over several machines.