No, you're right - I'm no web expert, and I didn't notice the option in deep-zoom composer to change format. The Seadragon dev told me to try png for this type

No, you're right - I'm no web expert, and I didn't notice the option in deep-zoom composer to change format. The Seadragon dev told me to try png for this type of image and it cut the data down from 93mb to 25mb - much faster now. (http://lovepixelzoom.appspot.com http://lovepixelzoom.appspot.com)