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-Information FAQ http://forums.adobe.com/message/4200840
1. It depends on what model of camcorder your video is coming from, what resolution and format it is, how well your project settings match your video, how long your video is and how powerful your computer is.
2. You can delete audio by right-clicking on a clip on your timeline and selecting the Delete Audio option.
3. You can randomly mix your clips using one of the InstantMovie Themes.
Naturally, it's easier to go into more detail with these answers when the questions aren't loaded into a single post. But those are the short answers.