I love the plugins

Hello!
I love the plugins and they have helped me speed this site up quite a bit, but it is still too slow, I think. 15 sec to load! It has been recommended that I use a CDN (content delivery network). I saw this on the gtmetrix.com site where I have been testing the speed, and also godaddy recommended it..that is where it is hosted. I have gone through the Hummingbird plugin and optimized it as much as I can...
My question is, will the CDN help the speed significantly or is there something else that can be done with Hummingbird. I am not a programmer, just a designer, so I don't feel comfortable going in and changing htaccess files etc. What do you recommend? I have made the site available for you to get into by the way.
Thank you in advance