Slideshow loading is very slow

Hello,

I’m having trouble getting my pics to load fast. Every third image takes 10 seconds to load and the following two are very fast, then the next one is a 10 second load again without the image loading icon and this repeats throughout the slideshow. Any suggestions?

http://www.hilarywalker.com.au

Cheers,

Hilary.

http://ww.wp.xz.cn/plugins/portfolio-slideshow/