gistfile1.txt

// ES6 class
function testClass(N){
  class Foo {
    constructor(prop1, prop2) {
      this.prop1 = prop1;
      this.prop2 = prop2;
    }

    get getter1() {}
    method1() {}
    method2() {}
  }
  for (let i = 0; i < N; ++i){
    new Foo(i, null);
  }
}
testClass(1e6);

// ES5 prototype
function testClass(N){
  function Foo(prop1, prop2) {
    this.prop1 = prop1;
    this.prop2 = prop2;
  }
  Foo.prototype.method1 = function () {};
  Foo.prototype.method2 = function () {};
  Object.defineProperty(Foo.prototype, 'getter1', { get() {}, configurable: true });

  for (let i = 0; i < N; ++i){
    new Foo(i, null);
  }
}
testClass(1e6);