I have no issues with Aperture on my 11" so I'm not sure whats slowing you down so much. But as for saying Lightroom is faster, then you're right. I made a HUGE mistake in switching to A3 and now that I'm here I can't switch back because Id have to redo over a years worth of work.I just tried aperture and good grief it is soooooo slow on the new 13" air. Noise reduction, sharpening, adjustment brushes...it was so frustrating. Lightroom does a simpler, and IMO better, preview render which makes it about 200x faster...
Is there a way to change the behaviour? It was brutal.
IF there was some sort of migration tool to go from A3 to LR then I'd be all over it because I really don't think Apple cares a bit about the Pro market customers anymore. We are WAY overdue for a bug fix.