gistfile1.js

console.time('local');

var myObject = {
  key1: {
    key2: {
      key3: 1
    }
  }
}

var temp = myObject.key1.key2.key3;

for (var i = 0; i < 10000; i++) {
  temp++;
}
myObject.key1.key2.key3 = temp;

console.timeEnd('local');