Assuming 50% of your content is audio, that still eaves 1Mb of video data which is a lot. So I would presume that your presentation contains a fair bit of visual data.
When possible, if not all the data is always goign to be necessary, it's best to load in sections. For example if you have a site which has some information about you and your portfolio, I may not want to look at your portfolio, so making me wait while it loads is a waste of my time.
If your site can be broken down into segments I wuold recommend it. Then you can use loadMovieNUM to load content on demand.
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