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stbrummeon The smallest JavaScript libraries on the internet

That's true for commercial CDNs. However, these Javascript libraries are hosted on free (!) CDNs, such as those kindly provided by Google, Microsoft, etc.

stbrummeon The smallest JavaScript libraries on the internet

Author here: my website isn't about Javascript in the first place, it's about compression. I could have done something similar with PNGs, PDFs or ZIPs (same DEFLATE compression algorithm) but Javascript is much more widespread.

stbrummeon The smallest JavaScript libraries on the internet

Scroll down to the bottom of each page (e.g. http://minime.stephan-brumme.com/jquery/2.2.0/ ). There you will find a comparison of the major non-DEFLATE algorithms, such as Brotli, RAR, 7z, xz, bzip2.

stbrummeon The smallest JavaScript libraries on the internet

I clearly understand they don't want to waste hours on compression. But why don't they even achieve the level of a simple gzip -6 (default level) ? Especially Microsoft's CDN is very bad in this category.