You can read more from Google's own Matt Cutts. He outlines various tools you can use to measure speed and optimize your site as well.
Another very important reason to avoid Flash sites is that the push towards mobile technology is stronger and stronger every day. This is especially if you have a local business and people need to find you from their Blackberrys, iPhones and the like.
Leave Flash for the sites that are truly meant to be interactive.
Start a simple blog type site on Wordpress, Typepad ot Weebly for crying out loud.