FrontendHaltPerformance·Intermediate·Conceptual·1 min read
Why does a lazy-loaded feature need a loading state?
Short interview answer
Fetching the chunk takes real time on a real network, and without a fallback the user sees nothing, or a broken interaction, during that gap — the loading state communicates that something is happening rather than looking frozen.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.