Supported embedded linux platforms

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Hello everybody :)

I started developing a computervision application (stitching, object detection, background substractor) using a Raspberry Pi.

I profiled my code and it seems that a lot of time is wasted with copying the images.

Are there any well supported/documented alternatives to the Raspberry Pi that would provide better performance? (-> higher framerate and/or image size)

On a sidenote: How big is the performance impact of NEON support and multiple cores? Is there are roadmap for supporting CUDA on ARM? (https://en.wikipedia.org/wiki/Tegra_2#Upcoming_releases)

The Ouya seems to have a good cost-performance ratio. Opinions? https://en.wikipedia.org/wiki/Comparison_of_single-board_computers