compression-dictionary-transport

, template, common phrases, logos, inline svg's or data URI's, etc). This usually makes the HTML 60-90% smaller depending on how much unique content is in the HTML (there is a LOT of site boilerplate). - JSON API's can load a dictionary that has the keys and common values and basically yield a binary format on the wire for JSON data, compressing out all of the verbosity. I expect we're still just scratching the surface of how they will be used but the results are pretty stunning if you have a site with regular user engagement. FWIW, they are not "pre-shared" so it doesn't help the first visit to a site. The can use existing requests for delta updates or the dictionaries can be loaded on demand but it is up to the site to load them (and create them). It will probably fall over if it gets hit too hard, but there is some tooling here that can generate dictionaries for you (using the brotli dictionary generator) and let you test the effectiveness: https://use-as-dictionary.com/

er than just the first time easy-to-judge metric, the pictures all look very different. Then there's the other thing. The performance reasons for bundling are being eaten away. Preload & Early Hints are both here today & both offer really good tools to greatly streamline asset loading & claw back a lot of turf, and work hand-in-glove with import-maps. The remaining thing everyone points out is that a large bundle compresses better (but again at the cost of making incremental updates bad). The spec is in progress, but compression-dictionary-transport could potentially obliterate that advantage, either make it a non-factor, or perhaps even a disadvantage for large bundles (as one could use a set of dictionaries & go discover which of your handful of dictionaries best compress any given piece of code). These dictionaries would again be a first-load hit not different from a bundle's hit, but could then be used again and again by users, to great effect again for incremental changes. https://github.com/WICG/compression-dictionary-transport Bundles are such an ugly stain on the web, such an awful hack that betrays the web's better resourceful nature. Thankfully we're finally making real strides against this opaque awful blob we've foisted upon this world, our users, and ourselves. And we can start to undo not just the ugliness, but the terrible performance pains we've created by bundling so much togther.

d build an http server that takes raw uncompressed source. When asked for a file the first time, it compresses & builds the dependency maps in parallel, & saves both of these out, maybe a .gz with some xattr on it. Or store that data in memory, whatever. The first user gets a couple extra ms hit, but the server transparently still does the thing. Developer mode is just a tool to watch the file system & clear those caches, nothing more, & can potentially be completely separate. Bundles are just so awful. They complicate what used to be an elegant understandable clear world of computing. We can & should try to get back to resources, if it makes sense. And the cards are lining up to make this horrible un-web un-resourceful kludge potentially obsolete. I'm excited we might make the web make sense again for end-users. They deserve to be out of the bad times.