pfalls - amazingly, I spent the last 2 days of my holiday doing the same thing for a future open source project. I was just stumped when I saw you guys did the same (could have saved me a couple of days!)

I wanted to find the leanest Web framework on any kind of platform; but the difference from your approach - I already knew the kind of code that would run on it.

I tested: Go, Java (servlet, dropwizard), Scala (scalatra), Ruby, Node.js (connect).

For me it was:

* Scala

* Java

* Clojure (equal to Java - big surprise here)

* Node.js

* Go (almost equal to Node.js)

* Ruby (far far down)

Scala took the lead with amazing results. More over, a good metric was latency which Scala was the only one to take micro-second resolution.

I'm not a fan of Scala because of its surrounding tools, which is why I'm still considering going for either Clojure or Node.js.

I think the most surprising positively was Clojure, being that it is a dynamic language. And most surprising negatively was Go - by itself is impressive, but when given real work (Web handling, Redis/mongodb) goes bad quickly. Happy to see this correlates with your findings too; I'm assuming this is a symptom of library maturity..?

I'd be happy to see how Scala fares on your tests.

You've done an awesome job!