[acdha]

Culturally, who writes React apps with only those dependencies? I’ve done it for quick benchmarks and the like, but actual sites almost always have a huge amount of code to load. It’s like saying that you can have a Java app using only builtin libraries: true in theory but rarely in practice.

I found this really noticeable while traveling over the summer with limited bandwidth: the sites which took 5 minutes to fail to load completely all used React or Angular along with many, many other things posturing at being an SPA but the fast sites were the classic server-side rendered PHP with a couple orders of magnitude less JavaScript. It really made me wonder about how we’ve gotten to the point where the “modern” web is basically unusable without a late-model iPhone and fast Wi-Fi or LTE even when you’re talking about a form with a dozen controls.

[withinboredom]

Most of the problem there are people implementing their own timeouts in javascript instead of relying on the browser. The browser knows the difference between something taking 5m and making no progress vs. something taking 5m and making slow progress. Your application does not.

[acdha]

In this case, it’s simply putting a mountain of code into the critical path. If you have to load 30MB before the page works, it’s just not going to be a good experience. You can try to handle and retry errors but it’s better not to get into that situation in the first place.

[withinboredom]

That's what I mean. I've seen async loaders that wait 5s and don't see the file, then request it again. Before you know it, you're downloading 50 files of the same file or making 100 api requests to the same api endpoint.