I have used navigational menus and a flash animation on the main page of my web site. The increase in weight of the page is obvious in this case. The page size is 170 K now. I thought this page size is too heavy for Google. Then I checked my competitor’s website and they are also using heavy flash animations and navigational menus but their page size is not more than 60 K. Can I ask what the main reason of it is? Where I am missing anything or what should I do to use flash animation and navigational menu with reduced size like my competitors?

Please also share, why a heavy page size is not good for Google? If you reference by an article about it, it will be more helpful for me.