Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var x,y, i;
    
    function Thing(x, y)
    {
        this.x = x;
        this.y = y;
    }
    Thing.prototype.x = 0;
    Thing.prototype.y = 0;
    
    function TThing(x, y)
    {
        this.x = x;
        this.y = y;
    }
  };
</script>

Test runner

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for (i = 0; i < 1000000; i++) {
    y = new Thing(i, i);
}
 

for (i = 0; i < 1000000; i++) {
    x = new TThing(i, i);
}

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