Core Web Vitals audit and performance optimization roadmap
Diagnoses Core Web Vitals issues (LCP, INP, CLS) and creates a prioritized technical remediation plan.
Improve the site's Core Web Vitals metrics to meet Google's 'good' thresholds, ensuring performance is not a limiting factor for ranking.
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Prompt objective
Improve the site's Core Web Vitals metrics to meet Google's 'good' thresholds, ensuring performance is not a limiting factor for ranking.
Real use case
MegaStore, an electronics e-commerce site with 12,000 pages, has 78% of URLs classified as 'poor' on Core Web Vitals in Google Search Console. Average LCP is 5.2s (threshold: 2.5s), INP is 380ms (threshold: 200ms), and CLS is 0.32 (threshold: 0.1). The site is losing positions to faster competitors.
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Prompt
Conduct a complete Core Web Vitals audit for the site [SITE URL], running on [PLATFORM: WordPress/Shopify/Next.js/custom] with [NUMBER] indexed pages. **Phase 1 — Diagnosis (field + lab data):** Field data (CrUX / Google Search Console): - LCP (Largest Contentful Paint): current value, % of URLs good/needs improvement/poor - INP (Interaction to Next Paint): current value, distribution - CLS (Cumulative Layout Shift): current value, distribution - Segment by page type: home, category, product, blog, landing page - Segment by device: mobile vs. desktop Lab data (Lighthouse / PageSpeed Insights): - Analysis of the 5 most important pages: home, [PRIORITY PAGES] - Performance, Accessibility, Best Practices, SEO scores - Improvement opportunities listed by Lighthouse - Detailed technical diagnostics **Phase 2 — Root causes by metric:** **LCP > 2.5s — Common causes to investigate:** - Server response time (TTFB) — hosting, CDN, cache - Unoptimized hero images (format, size, lazy loading above-the-fold) - Render-blocking CSS/JS - Web fonts blocking rendering - Heavy third-party scripts **INP > 200ms — Common causes:** - Third-party JavaScript (analytics, chat, pixels) - Heavy event handlers on main thread - Layout thrashing during interactions - Slow hydration (for SPAs/SSR) **CLS > 0.1 — Common causes:** - Images/videos without dimensions (width/height) - Dynamically injected content (banners, pop-ups, ads) - Web fonts causing FOIT/FOUT - Iframes without reserved size **Phase 3 — Prioritized remediation plan:** For each issue identified: - Estimated impact on metric (e.g., LCP -1.2s) - Implementation complexity (low/medium/high) - Specific code/config to fix - Expected before/after Implementation order: 1. Quick wins (high impact, low complexity) — Week 1 2. Image and CDN optimizations — Week 2 3. JavaScript optimizations — Weeks 3-4 4. CLS fixes — Week 2 5. Server/infrastructure optimizations — Weeks 3-4 **Phase 4 — Ongoing monitoring:** - Set up Real User Monitoring (RUM) - Alerts for performance regressions - Performance budget by page type - Monthly CrUX data review in Search Console - Goal: 90%+ of URLs in 'good' within 60 days Deliver the technical report with implementation code for each fix.
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- 1Replace the key placeholders first: SITE URL, PLATFORM: WordPress/Shopify/Next.js/custom, NUMBER, PRIORITY PAGES.
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