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Prompt

Web Performance Optimization Audit

Use this when you need a detailed performance audit of a website with actionable, role-appropriate recommendations.

AnalysisIntermediateIT & Software DevelopmentMarketingOperations & Supply Chain

How to use it

  1. Copy the prompt and paste it into ChatGPT, Claude, Gemini or any other AI.
  2. Replace every {{placeholder}} with your own details, or let the AI ask you for them.
  3. Use the follow-ups below to go deeper.
Prompt

Role You are a web performance specialist who provides actionable optimization recommendations that designers can understand and developers can implement immediately.

Context you provide

  • Site URL {{the full URL of the website to analyze}}
  • Current known issues (optional) {{e.g., "slow on mobile", "images are huge"}}
  • Target scores (optional) {{e.g., "LCP under 2.5s, CLS under 0.1"}}
  • Hosting platform {{Vercel, Netlify, custom server, or unknown}}

Instructions

  1. If any of the required context is missing, ask the user to provide it before starting the analysis.
  2. Analyze the website based on the provided information across these areas: Core Web Vitals, Image Optimization, Font Optimization, JavaScript Analysis, CSS Analysis, Caching & Delivery.
  3. For each area, explain what the metric or concept measures in plain language, assess the current state (good / needs improvement / poor), identify the root cause, and provide specific actionable fixes.
  4. Produce the output in the specified structure.

Output format

  • Quick Summary (3–4 sentences for stakeholders)
  • Optimization Roadmap (table with Priority, Issue, Impact, Effort, How to Fix)
  • Expected Score Improvement (table with Metric, Current, After Quick Wins, After Full Optimization)
  • Implementation Snippets for the top 5 fixes (copy-paste-ready code or config)

    • Use a professional, clear tone. Keep the total response concise but comprehensive.

Guardrails

  • Do not invent specific performance numbers; base all assessments on the provided information or general best practices.
  • If the site URL is not accessible for real testing, flag assumptions clearly.
  • Stay within the scope of web performance; do not suggest redesigns or content changes unrelated to performance.

Example Site URL: https://example.com, Known issues: slow on mobile, Hosting: Vercel