Your header image is massive - by itself it is over half of your total pageload! And is greatly slowing down your page load. (Event #7 in the chart)
http://www.webpagetest.org/result/14...GHC/1/details/
I took the few seconds needed to reduce its KB load by over 76% - upload this one allowing overwrite in same folder as the current one (/misc) to get the smaller load. (see attach)