Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var someObject = {
      key: "value"
    }
    var Test = function() {
        this.x = someObject;
        var x = someObject;
    
        this.variante1 = function() {
          var value = this.x.key;
          return value;
        }
        this.variante2 = function() {
          var value = someObject.key;
          return value;
        }
        }
        
        
        
    var test = new Test();
  };
</script>

Test runner

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test.variante1();

test.variante2();

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