How can I efficiently view HUGE TIFF files on Linux? [closed]

view story

http://serverfault.com – I need a good image viewer that can view images that are 40,000x40,000 and several hundred megabytes in size at least. These are TIFF files. GIMP can open these but nothing else I've tried can; I often get the return "Image dimensions too large". but some viewers just fail. I have tried feh, qiv, graphicsmagick, gwenview, eog, and gpicview; gimp is the only one that can open the file, but it does so very slowly. I would think that there exists somewhere an optimized viewer that can load these huge images in a reasonable fashion. Anyone know of any? (HowTos)