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VMR9 framerate drop with large display

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http://stackoverflow.com/questions/17811763/wpf-mediakit-low-frame-rate-for-large-display-with-vmr9

I am using WPF MediaKit to render a directshow graph. The display framerate is fine if the wpf D3DRender is small. If I increase the size of the display (the control that is), the framerate drops significantly.

How do I prevent the drop in framerates? My display will need to occasional display the graph full screen, which causes the framerates to drop to an unacceptable value.

I heard the EVR (Enhanced Video Render) is much better than the VMR9. Will the EVR maintain the framerates when increasing the size of the display?

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