Headline: RSC is a serious win for bundle size and TTFB, but only if your team commits to the new mental model. Half-adoption is worse than not adopting at all.

What Actually Changed

RSC moves rendering of components that don't need interactivity to the server. The browser receives a serialized tree, not a JavaScript bundle. The result on a real e-commerce surface we migrated at Devya Solutions:

−42% client JS on the product listing page

−180ms TTFB after enabling streaming