I've heard the various comments explaining that AVCHD is far too compressed for Vegas and other NLEs to offer smooth previews in all but the most powerful computers. What I'm wondering is why it plays so smoothly in my $600 canon hg20 if it is so hardware intensive?
Bingo - same reason a bluray player and Television can do it - hardware designed to decode and display. Vegas would do this as well if it was coded for hardware acceleration like CUDA probably.
The camera does output at full resolution -- through the HDMI and component ports. Sounds like its time for Vegas and some electronics manufacturer to come together and build us a dedicated AVCHD board. Hmm, I wonder what company would be best suited for that job? It would have to be a mass producer, preferably one that produces computers, cameras and software.........
The software and hardware is there from Nvidia - simple video card plus CUDA - The video card can be ATI or Nvidia now - and can be the one a person uses for their video display card. Not sure if Nvidia would help though - other NLEs have gone this route to speed things up - Sony would probably just have to do the coding work I think like others have. It would likely help on a number of fronts including speed and preview smoothness.