You may also want to
Check download speed of images, this one took a while, (about 1.5 seconds), and I'm on broadband:-
http://www2.nature.nps.gov/air/webca...pkcam/grpk.jpg
You may wish to give Thumb Nails, smaller images that link to the larger image. Or you may be able to Compress the images more, Give warning of the delay because of size.
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Example of Thumb Nails)
Web Master Tools and Utilities Check download speed of images