The benchmark info: http://chadaustin.me/2011/01/digging-into-javascript-performance/ The code, in C++, JS, Java, C#: https://github.com/chadaustin/Web-Benchmarks/ The C++/JS/Java code runs on a single core. D2 version translated from the C# version (the C++ version uses struct inheritance!): http://ideone.com/kf1tz Bye, bearophile