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The problem is PDF and the viewers. some/most expand ALL the compressed images and create thumbs from the images before they start display, This uses huge amounts of memory, a technology fail, they just dont fit certain work. "If" you are lucky the viewer keeps it compressed so it fits in memory and only uncompresses a single image that is being displayed, this stops niceties like thumbs unless a background thread goes through the images and caches the thumbs (slow), this is where even a tiled tiff viewer could be a lot better. Someone needs to do a tiled compressed format along with a viewer and banish PDF to the other side of the moon. Dave Caroline