Really? Slow compilation or slow at runtime? Compilation, sure. Scala still has a slow compilation process but they're working to fix it. For a rapid prototype I don't think compilation time would be very material assuming rapid prototyping means 'something that exhibits the concept'
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Have you looked at Play! Framework?
I'm switching from java/scala to node.js/jade/coffeescript/express: I think it is really efficient for rapid development.
I've taken look at it. However, Play especially its Scala version is slow as hell.
Really? Slow compilation or slow at runtime? Compilation, sure. Scala still has a slow compilation process but they're working to fix it. For a rapid prototype I don't think compilation time would be very material assuming rapid prototyping means 'something that exhibits the concept'
Yes, I mean prototype which exhibit concept. I mean proof of concept implementations.
Try also HybridJava.
Agreed. Node is incredibly efficient for prototyping if nothing else.