On the Richards benchmark it's 1.9x. After 2 years this is pretty impressive. Due the nature of the Dart language the DartVM will make a number of optimization

On the Richards benchmark it's 1.9x. After 2 years this is pretty impressive. Due the nature of the Dart language the DartVM will make a number of optimizations possible that are not even possible in V8. So it will be a better platform for continued performance improvements. Time will tell... To be honest, even if it was only doing 0.5x, I'd still use it because the tooling makes me more productive. http://www.dartlang.org/performance/ http://www.dartlang.org/performance/