Why should I say I profile before optimizing?
Because it shows engineering judgment. Interviewers value candidates who measure before optimizing, fixing real bottlenecks instead of guessing. It demonstrates that you treat performance as an engineering problem, not guesswork.
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Talk about the Components and Profiler tabs, use a real bug example you found with DevTools, mention the why-did-this-render feature, connect DevTools to inspecting hooks, and emphasize that you profile before optimizing.
Explain that you record a render, find which components are slow or re-render too much, and use the why-did-this-render feature to pinpoint the cause. Connect it to a specific performance bug you fixed.
Because debugging is most of real development. Candidates who can methodically find and fix bugs using DevTools are far more valuable than those who only know syntax, since real work is mostly diagnosing and fixing.
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