Drawing In Wpf Application too Slow

I want to draw 开发者_StackOverflow1,000,000 lines in a Wpf Application. However, when I draw to MeshGeometry3D, the drawing is slow. How can the drawing speed be increased?

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These sites might help:

DrawingContext Class:

http://msdn.microsoft.com/en-us/library/system.windows.media.drawingcontext.aspx

WPF Graphics Overview: http://msdn.microsoft.com/en-us/library/ms748373.aspx