[winphone1974]

The key is used by the shadow Dom for update performance; the is no shadow Dom in svelte

[alserio]

List diffing is done even in svelte at runtime. Keys are used the same way as any other frameworks or frontend libraries, virtual DOM or reactive.

[afavour]

And yet Svelte is faster than React in pretty much every benchmark I’ve seen.

[patrickthebold]

That makes sense though right? One would assume that shadow dom and dom would be slower than direct dom manipulation.

[thinkloop]

I'm not sure that's a fair assumption, one of the original sells of a shadow dom was that manipulting the dom directly is extremely slow, so doing as much work away from it is faster.

[ttfkam]

Because React's model requires tracking the entire DOM tree for changes and rewriting whole branches where a change is detected.

Svelte bypasses the whole problem for the most part. https://youtu.be/AdNJ3fydeao?t=247