Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var x1 = 20, y1 = 41, x2=32.2,y2=323.2,  u = {x:(x1+x2)*0.5,y:(y2+y2)*0.5}
  };
</script>

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for (i=0;i<1000000;i++) {x = (x1+x2)*0.5; y = (y1+y2)*0.5;}
 

for (i=0;i<1000000;i++) {x = u.x; y = u.y}

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