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Yes, Instagram is super slow because of all its useless Javascript. And it took Twitter years of optimization to make it about as fast as static HTML.

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Actually, Twitter gave up on it every performing and everything is rendered server-side.

Actually, it gave up on performing _everything_ client-side, and now renders the first page server-side, and then handles subsequent rendering client-side.

It found a performant happy medium, which is something I hope React will enable a lot more people to do with a lot less work.

It doesn't. Subsequent requests are also rendered server-side and are passed down as HTML embedded in JSON that is splatted into the DOM. It isn't a lot of work to do this.

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