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Today I saw an article about a half-gig, 24000 square-pixel high-res composite image of the moon.

(This is a much smaller version of the image)
I find astronomy interesting, so I thought I'd download it and take a look. With 4GB of RAM and an i5 processor, I figured my computer could handle it. Unfortunately, the built-in Windows Picture Viewer didn't do such a great job. While it opened the file without a problem, zooming in was ineffective. The zoomed out image loaded, but zooming in just showed a scaled-up version of the zoomed-out version, not any detail:

Closing the picture viewer also took a very long time, and the whole process used up much more RAM than the 500MB of the picture (usage went from 1.3GB to 3.8GB).
What other software would work better for this? I would prefer something that is free and fairly simple. I don't really want to use an editor (like photoshop or GIMP), just a nice lightweight viewer. Any suggestions?

The Windows Photo Viewer works asynchronously. If you zoom in, it does not instantly actually zoom in, it just starts the asynchronous process of zooming. If you zoom back out, it stops the process. The program stays responsive like that. – sinni800 – 2011-03-08T08:40:42.480
My machine opened the file without problems. Windows Picture Viewer ate up 3 extra GBs of memory (on top of 2 GB before him), but scaling up and down was smooth. I have Core i7-930 and 12 GBs RAM, so this is, of course, no surprise it handled that well. But the app apparently doesn't handle well the situation, where RAM is not abundant. – Malcolm – 2011-03-08T12:33:25.183
Hm. Interesting to know that the photo viewer does work when there is enough RAM. Obviously it's not a practical solution for those of us with less memory though - a 0.5GB picture shouldn't take 3GB of RAM. Thanks for the info! @Malcolm. – nhinkle – 2011-03-08T17:58:38.710
Works great in irfanview on my i7 8gb windows 7 laptop, should work fine on your computer, only uses like 580mb of ram. Also tested microsoft photo viewer and it's super smooth. – Hardwareguy – 2011-03-08T18:30:21.540