test.js

var count = 3e6,
    values = new Array(count),
	repeats = 10;
  
console.log('generating numbers');
for (var i = 0; i < count; i++) {
  values[i] = ~~(Math.random() * 10); // <-- integers
  //values[i] = Math.random() * 10 // <-- doubles
}
console.log('done generating numbers');

for (;;) {
  var start = (new Date()).getTime();
  

  for (var x = 0; x < repeats; x++) {
    var sum = 0;
    for (var i = 0; i < count; i++) {
      sum = sum + values[i];
    }
  }

  var end = (new Date()).getTime();

  console.log("sum = " + sum);
  console.log("spent " + (end - start) / repeats + " ms");
}