obj-creation.js

var max = 100000000

console.time('empty loop')

function loop () {
  for (var i = 0; i < max; i++) {}
}

loop()

console.timeEnd('empty loop')

console.time('literal')
var obj = null

function literal () {
  for (var i = 0; i < max; i++) {
    obj = { i }
  }
}

literal()
console.timeEnd('literal')