Sample Answer
I’d step back and treat it as a flow redesign, not just “add one more call.” On a recent dashboard project, the page was doing 7 sequential API calls and initial load was ~6–7 seconds for ~20k users. Before adding a new analytics widget, I worked with the backend engineer to introduce a single aggregated endpoint that returned the core data the page needed in one round trip, and moved all heavy computations server-side. On the client, I split rendering into critical vs. non‑critical. Above‑the‑fold data used the new aggregate endpoint and loaded first; secondary widgets loaded lazily and in parallel. We also added HTTP caching (ETags) and normalized the data in a client store so multiple components reused the same response instead of refetching. Net result: perceived load time dropped to ~1.8 seconds, total API calls on first paint went from 7 to 2, and we were able to add the new feature without any increase in user‑reported slowness.
Keywords
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