| Pages Router | App Router | Improvement % | |
|---|---|---|---|
| JS bundle size | 1.2 MB | 173 KB | 85% less JS shipped |
| HTML response time (shows how fast the server generates and sends the HTML) | 51.8 s | 15.7 s | 70% faster server execution |
| Web Vitals: FCP | 5.8 s | 1.9 s | 65% better |
| Web Vitals: LCP | 5.8 s | 2.8 s | 50% better |
| Web Vitals: INP | Most interactions: 80-100 ms | Most interactions: 30-40 ms | 60% better |
Last active
January 12, 2026 08:21
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This table was needed for the How Preply improved INP on a Next.js application (without React Server Components and App Router) article.