Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {
      "a": "12",
      "b": "3s",
      "c": "a2",
      "d": "4x",
      "e": "d3",
      "f": "12",
      "g": "3s",
      "h": "a2",
      "i": "4x",
      "j": "d3",
      "k": "12",
      "l": "3s",
      "m": "a2",
      "n": "4x",
      "o": "d3",
      "p": "4s",
      "q": "12",
      "r": "3s",
      "s": "a2",
      "t": "4x",
      "u": "12",
      "w": "3s",
      "x": "a2",
      "y": "4x",
      "z": "d3"
    };
    var vC = "c";
    var vV = true;
    var f1 = function() {};
    var f2 = function() {};
  };
</script>

Test runner

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for (var key in obj) {
  if (key !== vC) {
    if (vV === true) {
      f1();
    } else {
      f2();
    }
  }
}

if (vV === true) {
  for (var key in obj) {
    if (key !== vC) {
      f1();
    }
  }
} else {
  for (var key in obj) {
    if (key !== vC) {
      f2();
    }
  }
}

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