Hello, there,
I am afraid that the way that Cloudfront handles images completely bypasses your WordPress server and our plugin. Let me explain a bit about the unusual cases one might confront.
Our plugin can work with a CDN, although this feature is still a bit experimental. “Experimental” means that we cannot yet support CSS background images.
Also, in order for our plugin to work with a CDN for your everyday IMG elements, the CDN must respect any url parameters on IMG elements, because this is the technique we use at this point.
Let me know if I can help any further!
Cheers,
Takis
PS: If I may add an observation I made, I have to say that I did notice a lot of Javascript related delays in your web page. These might be due to many scripts running on the page load coming from WordPress or jQuery plugins, etc. Also I could point you to the inclusion of the HTML5 Youtube videos in the home page, which do seem to take quite some time to prepare.