gistfile1.js

var s = "qwertyuiop";

for (var i = 0; i < 10; i++) s += s;

s.charCodeAt();

function str2buffer(s) {
  var length = s.length;
  var b = new Buffer(length);

  for (var i = 0; i < length; i++) b[i] = s.charCodeAt(i);

  return b;
}

var start = Date.now();
for (var i = 0; i < 1000; i++) {
  str2buffer(s);
}
var end = Date.now();

console.log(end - start);