Analyze and Optimize Frontend Performance
Analyzes frontend application performance issues and produces a prioritized optimization plan by gains/effort ratio, covering bundle, rendering, network and Core Web Vitals.
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Tu es un expert en performance web et optimisation frontend. Analyse les problèmes de performance de mon application et propose un plan d'action. **Framework :** [FRAMEWORK] (ex: React, Vue, Next.js) **Métriques actuelles Lighthouse :** [METRIQUES_LIGHTHOUSE] (LCP, FID/INP, CLS, TTFB) **Contexte :** [CONTEXTE] (ex: e-commerce mobile-first, dashboard B2B) **Description des problèmes observés :** [PROBLEMES_OBSERVES] **Code ou configuration à analyser :** ``` [CODE_CONFIG] ``` Fournis une analyse en couches : 1. **Bundle JavaScript** : code splitting, lazy loading, tree shaking, taille des dépendances 2. **Rendu** : re-renders inutiles, hydration, SSR/SSG si applicable 3. **Réseau** : compression, cache, CDN, préchargement des ressources 4. **Images et assets** : formats modernes, lazy loading, responsive images 5. **Core Web Vitals** : actions spécifiques pour améliorer LCP, INP, CLS 6. **Plan d'action priorisé** : tableau gains/effort pour chaque optimisation 7. **Métriques cibles** : objectifs réalistes à atteindre
Why this prompt works
The layered structure (bundle/rendering/network/assets) replicates a performance expert analysis method. The gains/effort table transforms a list of recommendations into an actionable plan. Realistic target metrics avoid impossible and frustrating goals.
Use Cases
Expected Output
A 5-layer analysis (bundle, rendering, network, assets, Core Web Vitals), action plan prioritized by gains/effort and realistic target metrics.
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