FrontendHaltReact·Advanced·Conceptual·1 min read
What is selective hydration?
Short interview answer
React can prioritize hydrating parts of a streamed interface based on readiness and user interaction instead of treating the whole page as one blocking unit. This improves responsiveness but does not excuse shipping excessive client code.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.