Native ES6 Promive vs. polyfill (https://github.com/lahmatiy/es6-promise-polyfill)

tests.js

//
// Case 1
//

var a = [];
var t = performance.now();

for (var i = 0; i < 10000; i++)
  a.push(new Promise(function(){}));
  
console.log(performance.now() - t);


//
// Case 2
//

var a = [];
var t = performance.now();

for (var i = 0; i < 10000; i++)
  a.push(new Promise(function(r, rj){ a.push(r, rj) }));
  
console.log(performance.now() - t);


//
// Case 3
//

var a = [];
var rr = function(){};
var rj = function(){};
var t = performance.now();

for (var i = 0; i < 10000; i++)
{
  var p = new Promise(function(r, rj){ a.push(r, rj) });
  p.then(rr, rj);
  a.push(p);
}

console.log(performance.now() - t);

tests_results.md

Browsers

• Chrome 35
• Firefox 30
• Internet Explorer 11

Case 1

• Native
  • Chrome: 105ms / 1Mb
  • Firefox: 90ms
• Polyfill
  • Chrome: 15ms / 320Kb
  • Firefox: 17ms
  • IE: 5.7ms / 680Kb

Case 2

• Native
  • Chrome: 154ms / ~7.6Mb
  • Firefox: 113ms
• Polyfill
  • Chrome 35: 18ms / 1.32Mb
  • Firefox: 25ms
  • IE: 6.4ms / 1.84Kb

Case 3

• Native
  • Chrome: 162ms / ~10.5Mb
  • Firefox: 161ms
• Polyfill
  • Chrome: 50ms / 2.7Mb
  • Firefox: 39ms
  • IE: 12ms / 2.84Kb