Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function internalTestFunction() {
      this.property += Math.random();
    }
    
    function externalTestFunction(object) {
      object.property += Math.random();
    }
    
    function prototype_constructor() {
      this.property = Math.random();
    };
    
    window.pp = prototype_constructor;
    
    prototype_constructor.prototype = {
      testFunction: internalTestFunction
    };
    
    function object_constructor() {
      this.property = Math.random();
      this.testFunction = internalTestFunction;
    };
    
    function external_constructor() {
      this.property = Math.random();
    }
    
    var prototype_suit = [];
    var object_suit = [];
    var external_suit = [];
    var n = 100;
    while (n--) {
      prototype_suit.push(new prototype_constructor);
      object_suit.push(new object_constructor);
      external_suit.push(new external_constructor);
    }
  };
</script>

Test runner

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var n = 100;
while (n--) {
  prototype_suit[n].testFunction();
}

var n = 100;
while (n--) {
  object_suit[n].testFunction();
}

var n = 100;
while (n--) {
  externalTestFunction(external_suit);
}

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