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Next.js 15 Performance Optimization: Real-World Results
Case Study

Next.js 15 Performance Optimization: Real-World Results

How we achieved 98+ Lighthouse scores and sub-1s load times in production.

11/18/2024
10 min
Next.jsPerformanceOptimization

Next.js 15 Performance Optimization: Real-World Results


Achieving 98+ Lighthouse scores and sub-1s load times is possible with Next.js 15. Here's how we did it.


Initial Performance Metrics


Before optimization:

  • Lighthouse Performance: 72
  • First Contentful Paint: 2.8s
  • Time to Interactive: 4.2s
  • Total Blocking Time: 380ms

    • Optimization Strategies


    1. Image Optimization

  • Use Next.js Image component
  • Implement proper sizing
  • Use WebP format
  • Lazy load below-the-fold images

    • 2. Code Splitting

  • Dynamic imports for heavy components
  • Route-based code splitting
  • Component-level code splitting

    • 3. Caching Strategy

  • Static generation where possible
  • Incremental Static Regeneration (ISR)
  • Edge caching with Vercel

    • 4. Bundle Optimization

  • Tree shaking unused code
  • Minimize dependencies
  • Use production builds

    • Results


    After optimization:

  • Lighthouse Performance: 98
  • First Contentful Paint: 0.8s
  • Time to Interactive: 1.2s
  • Total Blocking Time: 50ms

    • Key Takeaways


    Performance optimization is an ongoing process. Regular monitoring and incremental improvements lead to the best results.


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