Optimizing Next.js App Router for 95+ Lighthouse Scores at 1M+ Scale

Core Web Vitals Optimization Checklist

High performance directly correlates with user conversion and recruiter satisfaction. Here are the core optimizations applied to our React 18 / Next.js production platforms:

• **Image Optimization**: Using `next/image` with explicit aspect ratios and modern WebP/AVIF formats.
• **Font Loading**: Utilizing `next/font` with CSS `font-display: swap` to eliminate render-blocking font downloads.
• **Code Splitting**: Dynamic dynamic imports (`next/dynamic`) for non-critical drawers, modals, and charts.
• **Zero-Flash Dark Mode**: Implementing CSS custom property variables and class-based theme providers to eliminate FOUC (Flash of Unstyled Content).