Diagnose and fix slow-loading web pages

Slow page loads frustrate users and hurt SEO. Common causes include unoptimized images, excessive JavaScript bundles, render-blocking resources, and inefficient data fetching patterns that delay the first meaningful paint.

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Error messages you might see

Largest Contentful Paint (LCP) exceeded 2.5 seconds threshold
Total Blocking Time (TBT) exceeded 200 milliseconds threshold

Why this happens in AI-generated code

1

Unoptimized images and assets

AI-generated code uses raw <img> tags with unoptimized images instead of Next.js Image component or proper srcset, loading megabytes of unnecessary image data.

2

Excessive client-side JavaScript

AI tools import entire libraries (import _ from 'lodash') instead of specific functions, and add heavy client-side dependencies that bloat the JavaScript bundle sent to browsers.

3

Waterfall data fetching

AI-generated code fetches data sequentially (fetch A, then fetch B, then fetch C) instead of in parallel, causing each request to wait for the previous one to complete.

How to fix it

1

Optimize images and enable lazy loading

Use Next.js Image component or a CDN with automatic optimization. Add loading='lazy' to below-the-fold images and use modern formats like WebP or AVIF.

2

Reduce JavaScript bundle size

Use dynamic imports (next/dynamic) for heavy components, import only specific functions from libraries, and analyze your bundle with @next/bundle-analyzer to find the largest dependencies.

3

Get professional help

Still stuck? Our engineers can audit your site performance and implement optimizations. Visit /products to get started.

Related technologies

Next.jsReactJavaScript

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Frequently asked questions

What is a good page load time?

Google recommends LCP under 2.5 seconds, First Input Delay under 100ms, and Cumulative Layout Shift under 0.1. Use Lighthouse or PageSpeed Insights to measure your Core Web Vitals.

Does server-side rendering improve page load speed?

SSR improves perceived load time because the browser receives HTML immediately instead of waiting for JavaScript to render. However, Time to Interactive may be similar. Use SSR with streaming for the best results.

Related resources

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