title: Delphi fast file copy
body: <p>I'm writing an app that supposed to copy a bunch of files from one place to another.
  When I'm using TFileStream for the copy it is 3-4 times slower than copying the files with the OS.</p>
  
  <p>I also tried to copy with a buffer, but that was too slow aswell.</p>
  
  <p>I'm working under Win32, anyone got some insights on this matter?</p>