Next.js 15 Performance Optimization Strategies

Performance is critical for user experience and SEO. Here's my comprehensive guide to optimizing Next.js applications based on real-world projects.

Core Optimization Techniques

1. Image Optimization

Use Next.js Image component with priority for above-the-fold images and lazy loading for others.

2. Code Splitting

Use dynamic imports to lazy load heavy components.

3. Font Optimization

Use next/font for optimal font loading with display swap.

Advanced Techniques

Server-Side Optimization

Use generateStaticParams for dynamic routes and implement proper caching with revalidation.

Database Optimization

Use connection pooling and select only needed fields.

Results

After implementing these optimizations:

• Lighthouse score: 95+ across all metrics
• First Contentful Paint: Under 1.2s
• Largest Contentful Paint: Under 2.5s
• Bundle size: Reduced by 40%