title: Windows application very slow when using transparency
body: <p>I am writing a windows application with C# in visual studio .net 2005.</p>
  
  <p>In the form , there are some control with transparent Background; the form opens maximised and with full screen background.</p>
  
  <p>The application runs very slow with high CPU usage.</p>
  
  <p>Why is this?</p>