I assume 99% of users are using downsampling, to get thumbnails.
The downsampling also isn't that great.
Original image: https://raw.githubusercontent.com/haasn/cms/master/rings_lg_...
Downsampled with imgix: http://chen.imgix.net/rings_lg_orig.png?w=400
Downsampled with imagemagick: https://0x0.st/1-.png http://i.imgur.com/Nvl7tAm.png
Downsampled with imagemagick, gamma correct: https://0x0.st/1i.png http://i.imgur.com/Hrm4COb.png
Note how the luminance becomes square in the center (step back a bit if you can't see it), and also the edge pixels on the imgix version.
You don't even have to click the link, just simply get Chrome to load it into memory
edit: looks like something to do with Chrome's pre-fetching and https cert parsing, I think they're literally parsing the "0x0" string within the cert as a memory location
Most importantly, it doesn't have the horrible box window that the imgix resampler has.