Building Performant Web Applications

Performance is crucial for user experience and SEO. Here's how to build lightning-fast web applications.

Core Web Vitals

Focus on three key metrics:

1. Largest Contentful Paint (LCP) - under 2.5 seconds
2. First Input Delay (FID) - under 100 milliseconds
3. Cumulative Layout Shift (CLS) - under 0.1

Optimization Strategies

Image Optimization

Use Next.js Image component for automatic optimization:

import Image from "next/image";

<Image
  src="/hero.jpg"
  alt="Hero image"
  width={1200}
  height={630}
  priority
/>;

Code Splitting

Leverage dynamic imports for better performance:

import dynamic from "next/dynamic";

const HeavyComponent = dynamic(() => import("./HeavyComponent"), {
  loading: () => <Spinner />,
});

Font Optimization

Use next/font for optimal font loading:

import { Inter } from "next/font/google";

const inter = Inter({
  subsets: ["latin"],
  display: "swap",
});

Measuring Performance

Use Lighthouse and Chrome DevTools to measure and track performance metrics regularly.

Conclusion

By following these best practices, you can achieve excellent performance scores and deliver superior user experiences.