Audit and Fix Lighthouse Performance Issues in Batches

PageSpeed Enhancer is a structured, batch-wise audit-and-fix workflow for all four Lighthouse pillars, following a strict five-phase order: ingest and parse scores, batch scan all four sections in parallel, produce a consolidated risk report ranking changes by impact vs risk, apply fix batches in safe order (low-risk before high-risk), then a verification checklist. It never jumps straight to fixes without completing the scan and risk assessment phases first.

Use it when a user pastes a PageSpeed Insights report or mentions Lighthouse scores, asks to improve Core Web Vitals (LCP, FCP, CLS, TBT, SI), needs help with render-blocking resources, unused JavaScript, image optimization, security headers, ARIA compliance, or SEO meta tags, or asks why LCP is slow or how to fix an accessibility/SEO score.

Phase 1 extracts the four pillar scores (Performance, Accessibility, Best Practices, SEO), each flagged metric with its value and Lighthouse weight, and identifies the single critical-path bottleneck, output as a Score Summary Table. Phase 2 runs four parallel batch scans: Performance (LCP breakdown checking TTFB and render delay, render-blocking resources, CSS @import rules which are 2x render-blocking versus <link>, unused JavaScript percentage, network dependency chain, forced reflows, WebP/AVIF image delivery, Speed Index progressiveness, CLS culprits like missing width/height, long main-thread tasks over 50ms, and bundle sizes checking for any single JS chunk over 500KB gzipped), each finding recorded with root cause and fix category (Quick Win / Medium Effort / Refactor Required); Accessibility (ARIA correctness, WCAG AA color contrast, descriptive alt text, keyboard navigation, skip links, heading hierarchy, 44x44px touch targets, form labels, valid lang attribute, font-display: swap); Best Practices (security headers often unflagged by Lighthouse's score but critical - CSP, COOP, X-Frame-Options/frame-ancestors, HSTS with includeSubDomains+preload, Trusted Types, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, checking both netlify.toml and vercel.json when both exist since they use different syntax); and SEO (title tag length, meta description length, canonical tags, hreflang, robots.txt, JSON-LD structured data, alt attributes, descriptive link text, crawlability, and verifying SPA meta injection via View Page Source rather than DevTools Elements since react-helmet-async or Next.js Head-injected tags may not show in the DOM inspector).

Each fix batch is applied in risk-ranked order, low-risk first, so early wins don't get blocked waiting on riskier refactors, and every change is checked against a final verification checklist before being considered complete.

Frontend developers and site owners working from a real PageSpeed Insights or Lighthouse report who want a structured, risk-aware fix plan across all four pillars instead of chasing individual audit warnings one at a time.