extremely slow loading

So I use Photospace on around a 100 client sites, and there is usually no problems whatsoever. However one certain site seems to be having massively slow loading issues. I have tried all the normal steps. Deactivate all plugins change to default theme and I am still left with a gallery that loads incredibly slow. Even if it just has a few images in it.

Can you help in any way. Here is a a link to the site.

http://susannapatterson.com/portfolio/dogs-2013/

https://wordpress.org/plugins/photospace/