Xtion + openframeworks + Raspberry Pi

I have combined the code from the haarFinderExample
of_v0.8.4_linuxarmv7l_release/examples/addons/opencvHaarFinderExample
and the project I packed, and it's running at 2 FPS on Raspberry Pi 2.
(even when not drawing the found rects in an FBO)

So clearly if you want to do face detection and something visual or just need a framerate higher than 2fps a Raspbery Pi 1 or 2 is not a good solution.