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My best guess is that the java one is slow due to ebean (I've always seen huge performance improvements from switching to raw jdbc). The scala one I have no clue.
I think that the play-java one would likely benefit greatly from using raw jdbc rather than the ebean ORM. In fact my best guess is this is why the scala/java versions are so far apart. In past projects, scrapping ebean always led to large performance improvements in throughput, etc.
Lately I have been using Java/Scala + Play2 + MySQL and MongoDB/CouchDB. For some of my contract work I use the full JavaEE stack (including JSF, JSP, etc).
I have also used Python and Clojure quite a bit recently, and plenty of other frameworks and languages in the past.
Agree on the picking up of new techs being fun, probably why I have used so many different techs over the past few years.