[Plugin: NextGEN Gallery] Slideshow timing in Nextgen

see gallery options –> slideshow

I have set the slideshow speed to 3 seconds but it is taking ages up to 30 seconds to load. Is this a problem with my network connection? Anything else I can do. http://www.davidrogers.co.za/photo-workshops/workshop-galleries-2011/best-of-botswana-in-the-green-february-2011-2/ is the link that is taking so long. Would love to get some help on this?