FrontendHaltPerformance·Intermediate·Conceptual·1 min read
Can a perfect Lighthouse score guarantee good field vitals?
Short interview answer
No. One lab run cannot represent the distribution of real users or later interactions. It can identify opportunities, while field telemetry and CrUX reveal actual population performance.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.