Update 2013-12-30: New feature 32 bit floats pushes asm.js performance to 70% of native. More JavaScript engines support asm.js. The conclusion mentions LLJS as another asm.js source language. asm.js defines a subset of JavaScript that can be compiled to fast executables. It has been created at Mozilla by David Herman, Luke Wagner and Alon Zakai. According to the specification, “[asm.js] effective