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I've seen similar discrepancies in performance from the driver based on computer as well. See http://code.ros.org/lurker/message/20110105.220655.b7e05812.en.html (though in that situation, all of the computers in question had enough CPU horsepower to not drop the framerate).

Could you report which camera you are using? Also, no idea if you can get a monitor on the overo, but if you can, you could use guvcview to see if that also experiences a slow down in frame rate when you try to use similar settings to the uvc_camera driver.