FLVPlayback using waaaay to much ram, crashing browser

Hey,
I’m working on a freelance job making a flash site that uses about 30 flv/f4v videos which make up the pages and transitions between pages.

The site pre-loads about 15 of them so navigation doesn’t involve any loading time.

All the videos (mostly f4v) make up less than 20MB, even less than that are pre-loaded.
But when I run the site, I get upward of 500MB memory usage that only goes up when the non-preloaded videos are loaded to be played.

I made an empty project that only loads the 15 video files, and it uses ~500MB… with nothing but a FLVPlayback component and a bit of code to load the videos…

Of course I don’t have any issues using 500MB of ram, but people testing the site are getting browser crashes and plugin crashes (white and gray exclamation mark).

Is this normal, or could there be something wrong with the f4v files?
Shouldn’t pre-loading only load the file itself? Does anyone know where all this extra memory usage is coming from and if there’s anything I can do about it?

I really appreciate any help or information you can offer,
Thanks.

-Matt