javascript - storing document in a variable -

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I wonder if I store the document in a variable whether there will be a speed increase, so if I have < / P> 

  var doc = document; MyElement = doc.getElementById ('Some Thing');   
 I know in this example that it will not be very different, but my thinking is that my variable will act as a "pointer" in the form of a document and hence the M script No need to try and see the document back.   
 
 
 Document is a global object in context of another variable and then document instead of document How fast can it be? This is a vertical question :)

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