i am currently using sony vegas for editing on my computer. Specs are 1.83 ghz 3 gb ddr ii ram nvidia 8400 gs 256 mb. Now my problem is that the preview is very slow even in quarter draft preview. I'm editing video to music and while playing it to check if the video goes along it just shows 1 or 2 frames may for the entire 10 seconds that i play it. Also i'm using 720p footage. Now is sony vegas 10 better in this regard than 7 or no. And if no which software should i use that will give me smooth preview playback. Please do not mention casual video editors like movie maker or powerdirector. I want something thats as powerfull as vegas. Also upgrading my system is not an option for me. Thank you!