Next.js Performance Explained — Optimization and Monitoring

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you will learn about Next.js Performance Explained. We cover key concepts, practical examples, and best practices to help you master this topic.

Next.js includes built-in performance optimizations (automatic Code Splitting, image optimization, font optimization) and tools for measuring and improving Core Web Vitals.

What You'll Learn

Core Web Vitals in Next.js
Bundle analysis with @next/bundle-analyzer
Caching strategies
Edge runtime for low latency
Performance monitoring

Why It Matters

Performance directly impacts user experience, SEO ranking, and conversion rates. Next.js provides tools to optimize and measure every aspect of page performance.

// app/report-web-vitals.jsx
"use client";

export function reportWebVitals(metric) {
  switch (metric.name) {
    case "FCP":
      console.log("First Contentful Paint:", metric.value);
      break;
    case "LCP":
      console.log("Largest Contentful Paint:", metric.value);
      break;
    case "CLS":
      console.log("Cumulative Layout Shift:", metric.value);
      break;
    case "INP":
      console.log("Interaction to Next Paint:", metric.value);
      break;
    case "TTFB":
      console.log("Time to First Byte:", metric.value);
      break;
  }
}

// next.config.js
const withBundleAnalyzer = require("@next/bundle-analyzer")({
  enabled: process.env.ANALYZE === "true",
});

/** @type {import("next").NextConfig} */
const nextConfig = {
  experimental: {
    optimizePackageImports: ["lucide-react", "@heroicons/react"],
  },
};

module.exports = withBundleAnalyzer(nextConfig);

ANALYZE=true npm run build

Expected output: Bundle analysis report shows package sizes, Core Web Vitals are tracked in analytics, and optimizePackageImports reduces bundle size.

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