Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var d1 = {
       keyA1: { keyB: 1 },
       keyA2: { keyB: 1 },
       keyA3: { keyB: 1 }
    };
    
    var tmp = { keyB: 1 };
    var d2 = {
       keyA1: tmp,
       keyA2: tmp,
       keyA3: tmp
    }
  };
</script>

Test runner

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d1.keyA2.keyB

d2.keyA2.keyB

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