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Not sure about JWST, but for Earth-observing satellite data it's common to store data in formats that support tiling and ranged reads so that clients are only loading the parts of the dataset relevant to current view.

My guess is something similar is happening here on the other side of that library.

I think most operating systems let you set a web page as your wallpaper... or they used to, at least.

Not sure if there's a way to make this site load full screen by default though. And I don't know if the "desktop browser" can run user-scripts...

Heh, brought back memories of https://en.wikipedia.org/wiki/Active_Desktop

The other option is to use Chrome/Firefox headless mode and take a screen shot.

You can probably then crop it automagically with some command line image tool to get you an image for your desktop.