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Currently, https://josephg.com/sp/current returns a png with 3x8 (RGB) bits/pixel. But since the image has only 16 colors, you can reduce its filesize to ~20% (from ~714 to ~147 KB, with http://optipng.sourceforge.net/). Can't you can gain performance and reduce bandwith by keeping the image serverside as a 4 bit png?

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Yes. I wanted to do that, but I couldn't find a png library on npm that supports encoding 4 bit paletted pngs. Fixing that was on my todo list from day 1.

Although now that I think about it, I could probably get close by using an 8bit greyscale image and then apply the palette in the client. That would probably halve the image size.

Cool project! Optipng does many other optimisations but could be taxing on CPU. It should be very easy to put it in the stack for test though.

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