Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {
      v: 0
    };
    
    function test1() {
      with(obj) {
        v += 1;
      }
    }
    
    function test2() {
      obj.v += 1;
    }
    
    function bench(func) {
      for (var i = 0; i < 500; i++) func();
    }
  };

  Benchmark.prototype.teardown = function() {
    obj.v = 0;
  };
</script>

Test runner

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bench(test1)

bench(test2)

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