I imagine the flash plugin will struggle to produce decent framerates on complex animations if they're running fullscreen, even if the plugin has been well-optimised. It's a big screen for a modest processor and version 6 of flash wasn't the most speedy even on windows!

You could try embedding the swf file in an html page and reducing the size by specifying a width and height parameter.
see:
http://www.macromedia.com/cfusion/kn...cfm?id=tn_4150