Practice · 3 of 3

LCP Chain Timer

Write lcpEstimate(page) — a crude LCP model: ttfbMs + cssBlockMs + imageMs, where cssBlockMs = 50 per render-blocking css, imageMs = imageKB / 100 (KB per ms over 100KB/s effective). Return the total in ms. Write withinLcp(page) returning true when the estimate is <= 2500ms.

Difficulty: intermediate

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