A. No, it's just (a subset of) JavaScript. An asm.js program will behave identically whether it is run in an existing JavaScript engine or an ahead-of-time (AOT) compiling engine that recognizes and optimizes asm.js—except for speed, of course! A. It's early to say, but our preliminary benchmarks of C programs compiled to asm.js are usually within a factor of 2 slowdown over native compilation wit