FWIW-I have a fairly fast connection (sometimes) and all your image galleries loaded quite fast for me.
I agree with dlager that smaller images will upload faster, but more importantly it will also maximize your 3GB storage space and most importantly it will help your images remain clear because they are not being resized to fit your theme.
So my suggestions if you are having problems loading the site or uploading to the site are to first try the troubleshooting tips on this page http://en.support.wordpress.com/browser-issues/ If you are still having trouble after that, then try the advanced troubleshooting to see if there is a problem with your connection.
Also, make sure you are using an up-to-date browser. If you need to update then you can download one from this site http://browsehappy.com/