Hi, I've just made a cranky new JavaScript/ECMAScript parser, available at https://github.com/icefapper/lubejs .
P.S. it looks promising when run in node, where it runs some 21% faster than esprima with 'loc' on, but in chrome it lags miserably. I have no clue why.
Lube: A Faster and Slower Parser Than Esprima | Heykuki News