Comment by MadameMinty

Worth pointing out that PNG is also just awful and should probably die like BMP died. WebP was already available at the time this article was written:

PNG: 1039993 bytes - baseline

optimized*: 541539

WebP: 398974 - lossless mode, of course.

JPEG XL: 310778 - lossless, quick, and easy.

*after monumental compute effort; still probably some room for improvement but the effort is ridiculous.