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Web PerformanceHard~5 minPro

Debugging Slow LCP on a React Dashboard

What to Expect

System Design Discussion

The interviewer asks architecture questions and probes your decisions with follow-ups.3 signals evaluated

Interview Feedback

Numeric score, signal breakdown, staff engineer perspective, and strong candidate comparison.

Signals Tested

  • Distinguish between network latency and client-side rendering cost
  • Identify JS execution as the dominant LCP bottleneck in SPAs
  • Apply code splitting, lazy loading, and SSR strategies

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