If I remember what the state of Groovy is (around 2012). The compiler devs focussed quite heavily on functionality not performance. Even refused to go that direction.
It was quite bad.

Its a real shame. I liked it. Although if they had and had unsigned types I probably wouldn't be in D!

Since Groovy 2.0 there is optional static type checking and when using it performance is much better. When Groovy is run over the Havlak benchmark it is only 10% behind in speed compared to Java with static typing and only about 40% in behind when purely dynamic as with pre-2.0 Groovy. See the bottom most paragraph in the readme of https://github.com/oplohmann/havlak-jvm-languages

The benchmark in this article (http://java.dzone.com/articles/groovy-20-performance-compared) only measures method invocation time, but it also gives some idea that performance in Groovy is really good now.

What Scala is really good at is concurrency. You must give them that. Akka (akka.io) and new ideas about futures and promises really started in the Scala community. Some of that stuff also made it into JDK8. Something like Akka for D will be a killer app for D. It can't be done as a spare time activity, otherwise I would already have embarked on it ;-).

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