Orb is very CPU consuming, maybe that's your problem?
Also, you should have some decent upload to stream succesfully over the Internet. YouTube doesn't need that much bandwith; it's quality is rather poor.

On a sidenote: releasing Orb as a niche product for the N800 is, erhm, well, stupid. There is absolutely no difference to the 'older' versions of Orb. The display adaption you call 'the mobile version of Orb sized to fit the Nxx0 screen' is not new and not unique to the N800.