Enhance your understanding of key performance optimization strategies in Next.js with this technical quiz. Explore crucial concepts like data fetching, image handling, code splitting, and more to boost your Next.js project speed and efficiency.
When optimizing a dynamic blog site built with Next.js, which data fetching method should be used to pre-render pages at build time for better performance and faster initial load?
Explanation: getStaticProps allows pages to be generated at build time, which optimizes both performance and scalability by serving static HTML. getServerSideProps renders on every request, resulting in slower initial loads and more server effort. Using useEffect with fetch and fetching on the client side both delay data retrieval until after page load, harming perceived speed. For pages that do not often change, static generation is more efficient.
For faster image loading and reduced bandwidth usage in a Next.js website's gallery page, which built-in solution should be used to automatically handle optimization tasks like resizing and lazy loading?
Explanation: The Image component provides automatic image resizing, lazy loading, and responsive image support out of the box, improving visual performance. The img tag offers none of these optimizations and requires manual configuration. The picture element helps with responsive images but lacks built-in optimization features. The Canvas API is intended for drawing graphics, not straightforward image display or optimization.
If your Next.js application is loading slowly due to large JavaScript bundles, which optimization technique should you apply to ensure only necessary code for each page is loaded?
Explanation: Dynamic imports allow you to split code and load it only when certain components are needed, reducing the initial bundle size and improving load times. Adding more environment variables does not affect JavaScript bundle size. Inlining all CSS can sometimes increase the initial payload rather than improve performance. While increasing cache time helps re-use resources, it does not reduce the original download size of the JavaScript.
To minimize layout shifts and improve text rendering performance in a Next.js e-commerce site, which approach is recommended for loading custom web fonts?
Explanation: Self-hosting fonts ensures faster and more reliable delivery, and enables strategies like preloading and font-display control to prevent layout shifts. Relying solely on external CSS can result in slower font delivery and unwanted flashes of unstyled text. Downloading fonts inside useEffect is ineffective and too late in the rendering process. Embedding fonts in images is not practical and leads to poor accessibility and performance.
On a Next.js news portal that updates stories throughout the day, which feature can regenerate only affected static pages at runtime, balancing speed and freshness?
Explanation: Incremental Static Regeneration enables static pages to be updated in the background as new data arrives, maintaining both fast delivery and up-to-date content. Client-Side Routing only manages navigation and does not affect when content is updated. Service Worker Caching helps offline capabilities but doesn't regenerate pages. Memoization is a coding pattern for function optimization, not related to page regeneration on the server or at build time.