Yeah, and in that sense it's unsurprising - witness how v8 is still typically much, much slower than native C - but emscriptem does surprisingly well. Essentia

Yeah, and in that sense it's unsurprising - witness how v8 is still typically much, much slower than native C - but emscriptem does surprisingly well. Essentially, no human word use unhandy, verbose, hard to read syntax whereas a compiler might. Thus in practice the JS subset that handwritten code uses is different from that of compiler generated code.