title: MemoryStream replacement?
body: <p>A few weeks ago I read something about a new class in .Net 4/4.5 that performs better than <a href="http://msdn.microsoft.com/en-us/library/system.io.memorystream.aspx" rel="nofollow">MemoryStream</a>, but I can't seem to find it anymore. </p>
  
  <p>I've looked in the <a href="http://msdn.microsoft.com/en-us/library/system.io.aspx" rel="nofollow">IO namespace</a> and could not find anything. Does anyone remember reading something like that?</p>
  
  <p>Thanks</p>