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[XNA] Get the render target data and write it in a bytemap efficiently

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I'm trying to embedd my XNA Game into a WPF application.

For that, I'm getting all the pixels displayed on the actual render target, then write them in a writeable bitmap and display it on my WPF application.

(I followed this tutorial: http://remember.waralan.fr/?p=497 (Not in English though))


It works fine, but this line takes a lot of CPU:





And so I lose a lot of FPS.


I don't have any idea how I could get all pixels on the screen any other way... have you?



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