We have seen that there can be many reasons for users to opt-in to save-data, and that the performance delivered to devices doesn’t (yet) vary much based on the hint. A lack of awareness from both developers and web users mean that a potentially valuable web platform feature is under utilized.

And for what? Again - there is a swath of use cases which would be hard without React and which aren’t complicated enough to push beyond React’s limits. But there are also a lot of problems for which I can’t see any concrete benefit to using React. Those are things like blogs, shopping-cart-websites, mostly-CRUD-and-forms-websites. For these things, all of the fancy optimizations are optimizations to get you closer to the performance you would’ve gotten if you just hadn’t used so much technology.

It would seem that, realistically, the benefits of Brotli over Gzip are slight.
[…]
if you’re faced with the prospect of weeks of engineering, test, and deployment efforts to get Brotli live, don’t panic too much—just make sure you have Gzip on everything that you can compress (that includes your .ico and .ttf files, if you have any).

[…] est le premier moteur de recherche de livres en France. Il fédère 16 portails de libraires indépendants, nationaux, régionaux ou spécialisés, soit plus de 1000 librairies implantées sur l'ensemble du territoire.

So you have to be really careful when using this metric, the LCP is not always tracking the element you think

Web Performance and Web Performance Optimization are still valid and descriptive terms for our industry, but we might benefit from a change to our language when working with others. The language we use could be critical to the success of making the web a faster and more accessible place.

Un générateur de Lorem Ipsum sert à générer du faux texte en latin pour remplir des maquettes.
Un générateur de Lorraine Hipseaume sert à générer de faux prénoms et noms français pour remplir des maquettes.

So it looks as if a white academic male in hyper-individualist America thought that everyone in the world is like him. What a surprise.

The issue with most slow JAMstack sites is that they load a loooot of JavaScript. Remember that any added JavaScript has to be sent to the browser, which will also need more computation for it. It quickly impacts performance.