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> (gzipped size went from 16.6 KB down to 2.7 KB!!)

A couple orders of magnitude are missing from these sizes if my browser dev console is any indication. What are they even talking about.

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The polyfills, not their own code. Effectively all they did was update their browser support baseline, dropping support for very old browsers, with the result that about 14KB of code that made it work on those old browsers can now disappear, because more recent browsers don’t need it.

Ah, so they saved 14KB off their ~1MB javascripts by dropping old browsers. Must be a slow news day on HN I guess.

Maybe the news should be “dropping support for a bunch of browsers is only going to save you a few insignificant kB”.

It's nice to see ES6 moving along smoothly, but that's about it

They still support some older browsers, but serve a different bundle for them.

Wait, all of twitter (except for the content) is now about 3k?

No, according to the article it's just for polyfills.

As far as I remember, Twitter PWA was a React app, and React comes at about 30k minified gzipped.

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