IMO DeltaBlue is a terrible benchmark typology anyway. Benchmarks have to be localized for them to mean anything; and even then, they don't mean much 90% of the time. Dart's pretty neat (editing a book about it atm), but this kind of language zealotry is just silly. Dart is hardly a silver bullet. And many of the truly interesting features (mixins, isolates, fancier mirrors) are yet to be implemented or incomplete. Definitely keep an eye out for Dart, but don't fall all over yourself thinking that it outperforms Java (whatever that even means).