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The Emscripten author wrote a blog post when Cheerp (then called duetto) was first announced: http://mozakai.blogspot.co.uk/2013/11/c-to-javascript-emscripten-

• azakai 12y ago
  As far as I know that comparison is still up to date, but if the Cheerp devs are here maybe they can comment. I may do a followup post now, since Cheerp is at 1.0. Seems like a good time to do some benchmarking.