A small plugin and module, highly customizable to display picture randomly from your Smugmug gallery.
This module displays Smugmug photos using lightbox, lightbox2 or shadowbox.
I did correct that issue in version 1.1.0, available now
Concerning speed, SmugMug use Amazon S3, and since my code pull an image in specified size (default is 150x150 pixels) I can only see your internet provider as being in fault. Try at different time in the day...
On my demo server, it is pretty damn fast:
Try also to past this url ten times in a browser to pull some random images
it is fast no? my code don't do anything else...