"Another change we've made addresses playback of footage from your Canon HDSLR specifically. Our engineers have worked a little magic to develop a much more efficient method of decoding these files than was used in previous versions of Vegas Pro software. I won't pretend to understand the details of that new method, but the details don't matter anyway. All that matters is that the results are nothing short of spectacular. In Vegas Pro 10 you'll experience close to full-framerate playback on most modern computers at all Preview and Draft settings. Now you can really dig in and do some serious editing with the footage from these cameras!"
read more here:
http://www.sonycreativesoftware.com/news/article.asp?articleid=102#cont
read more here:
http://www.sonycreativesoftware.com/news/article.asp?articleid=102#cont