title: MemoryMappedFile with very slow CreateViewStream
body: <p>I'm using a memory mapped file that is approx. 100 GB of data. When I call <code>CreateViewStream</code> on that file it takes 30 minutes to create it and seems that it's because of the size of the memory mapped file but, why does take it so long?
  Does it copy the whole file into managed memory?</p>
  
  <p>It takes much longer when I write the file with a file stream and access it without a reboot. (strangely)</p>