Thanks to @chirrolafupa I added dithering to my build pipeline and now all the images only use a fourth of the previous bandwith.
The original, undithered version can still be viewed by clicking on the image.

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Merveilles is a community project aimed at the establishment of new ways of speaking, seeing and organizing information — A culture that seeks augmentation through the arts of engineering and design. A warm welcome to any like-minded people who feel these ideals resonate with them.