eirenelisted

# Eirene — Performance Checker Peace arrives only when everything works as it should. Eirene measures it. ## Steps ### 1. Identify the subject Accept a live URL or a codebase path. If a URL is provided, run Lighthouse if available. ```bash npx lighthouse {url} --output json --quiet 2>/dev/null | python3 -c " import sys, json d = json.load(sys.stdin) cats = d['categories'] audits = d['audits'] for k in cats: print(k, round(cats[k]['score']*100)) for m in ['first-contentful-paint','largest-contentful-paint','total-blocking-time','cumulative-layout-shift','interactive']: a = audits.get(m, {}) print(m, a.get('displayValue','n/a')) " ``` If no URL is available, audit the code for performance anti-patterns. ### 2. Core Web Vitals | Metric | Target | Actual | Pass / Fail | |---|---|---|---| | LCP (Largest Contentful Paint) | ≤ 2.5s | | | | INP (Interaction to Next Paint) | ≤ 200ms | | | | CLS (Cumulative Layout Shift) | ≤ 0.1 | | | | FCP (First Contentful Paint) | ≤ 1.8s | | | | TTFB (Time to First Byte) | ≤ 800ms | | | ### 3. Additional checks | Check | Pass / Flag / Fail | Note | |---|---|---| | Images served in modern format (WebP / AVIF) | | | | Images have explicit width and height attributes | | | | No render-blocking resources | | | | JS bundle size reasonable for scope | | | | Caching headers set appropriately | | | | Mobile performance (throttled 4G simulation) | | | ### 4. Verdict **PASS** — all Core Web Vitals green. **CONDITIONAL PASS** — marginal sco