Compression Dictionary Transport became an official IETF Proposed Standard this September (congratulations to Yoav Weiss & Pat Meenan 🎉). If you don't know what they are, I recommend watching Pat's wonderful performance.now() talk from 2023 – the TL;DR is that you can achieve incredible compress

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Compression Dictionary Transport is a new IETF standard that can reduce file sizes by 60-90% compared to Brotli/GZIP, now supported in Chrome and Edge. Implementation requires architectural decisions around dictionary generation (resource upgrades, standalone dictionaries, or similar resources), CDN configuration, and compression handling. The author details practical challenges including CDN limitations, library compatibility issues, cache keying strategies, and debugging complexities. Despite the implementation overhead, the 4x compression improvement enables benefits like inlining full CSS and aggressive prefetching. With only 13 websites currently using it, early adopters can gain significant performance advantages for 75%+ of web users.

From Theory to Tiny: Implementing Compression Dictionaries