Speed Issues and Humming Bird Smush Combo

Hi guys - I am hoping you can help.
I'm desperate to get my site loading faster - it is abysmal and I am running adwords and investing a lot of time and money into blogging.
I have installed Smush and run it on everything, and I have installed Hummingbird and minimized, combined and moved all the JS files to the bottom.
But my site speed still sucks. I suspect is has to do with my hosting as well.


Any thoughts?