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jsconf iceland was 4 years ago, not 3 years :) been a looooong wait https://youtu.be/nLF0n9SACd4

Congratulations to the React team! I remember three years ago when Dan first showcased some of the concurrent features [1], so this has been quite long in the making.

[1] https://www.youtube.com/watch?v=nLF0n9SACd4

These apps all fall flat, which is the point i'm trying to make. They're robust from a design perspective, the tools we have to build UI are good enough, but they can't compete against native. Do you think that using Svelte in any those would make a difference? This is why React is attempting to find a solution.

The problem is essentially the same. Native apps are also conflicted with load, they have better means than we have on the web to deal with it, but it's still low-level and complex to orchestrate, threading for instance. Any one of those means pushes your app into async issuee, race conditions that you need to reconcile. With concurrent mode scheduling is a first class concept, your components won't be subject to race conditions. React maintains 60fps, high-priority content (user input, animations, transitions) can be ran fluidly while lesser priority content gets deferred. It has a good chance of outperforming multithreaded native apps with that model.

This demo illustrates the issue: https://youtu.be/nLF0n9SACd4?t=172 which is universal. You run into this on native platforms as well as on the web.

Yes, but it scales with the environment and device capabilities. Watch this, it explains it in detail: https://www.youtube.com/watch?v=nLF0n9SACd4

The clearest demo that communicates what this solves was given when it was announced last year.

That clock animation is pure genius:

https://youtu.be/nLF0n9SACd4?t=473

Dan Abramov's talk starts 39 minutes into the livestream: https://www.youtube.com/watch?v=kz3nVya45uQ&t=39m

If you like live coding demos, he also gave a talk at JSConf Iceland where he showed off some future React features, such as asynchronous rendering: https://www.youtube.com/watch?v=nLF0n9SACd4