Building Faster Web Apps

Performance is not a feature — it is a foundation. Users abandon pages that take more than three seconds to load, and search engines factor load speed into their ranking algorithms. This article walks through the most impactful techniques for speeding up your web application.

Code Splitting

Modern bundlers like Webpack, Vite, and Rollup can split your JavaScript into smaller chunks that are loaded on demand. Instead of shipping one massive bundle, the browser downloads only the code it needs for the current page.

Dynamic Imports

Use import() to defer loading of non-critical modules. Combine with React's lazy and Suspense for component-level code splitting.

Image Optimization

Images often account for the majority of a page's byte weight. Serve next-gen formats like WebP or AVIF, use responsive srcset attributes, and add loading="lazy" to below-the-fold images.

Caching Strategies

Set aggressive cache headers for static assets with content-addressed filenames. Use a service worker to cache API responses and enable offline functionality.