Nuxt 4 vs Fastify + React
Real-world performance comparison based on identical SaaS dashboard implementations.
Nuxt 4
VPS
The intuitive Vue framework for building full-stack web applications. Nuxt extends Vue with file-based routing, auto-imports, and a powerful module ecosystem that handles everything from authentication to SEO. Nuxt 4 brings improved TypeScript support, faster dev server, and enhanced hybrid rendering with per-route SSR/SSG/ISR configuration. The Nitro server engine deploys anywhere—Node, Deno, Cloudflare Workers, or static hosting. If you're in the Vue ecosystem, Nuxt is the obvious choice. Its convention-over-configuration approach and rich module library (Nuxt Content, Nuxt Image, Nuxt Auth) accelerate development significantly.
Fastify + React
VPS
Node.js high-performance web framework combined with React SSR. Fastify is one of the fastest Node.js frameworks, built on a robust plugin architecture with JSON Schema validation and automatic OpenAPI documentation. This implementation uses Fastify as the server with custom React SSR integration. Fastify's encapsulation model keeps plugins isolated, while hooks provide fine-grained request lifecycle control. Ideal for teams with existing Node.js/Express experience who want better performance and structure. Fastify's plugin ecosystem covers everything from rate limiting to WebSocket support.
Performance Metrics
Lower is better for all metrics. Green indicates the faster framework.
| Metric | Nuxt 4 | Fastify + React | Winner |
|---|---|---|---|
| TTFB (p50) | 47.9ms | 42.95ms | ▶ |
| TTFB (p95) | 53.15ms | 46.06ms | ▶ |
| LCP (p50) | 72ms | 70ms | ▶ |
| LCP (p95) | 80ms | 78.2ms | ▶ |
| CLS | 0 | 0 | = |
| TBT | 0 ms | 0 ms | = |
| LCP → TTFB | N/A | N/A | - |
| LCP → Load Delay | N/A | N/A | - |
| LCP → Load Duration | N/A | N/A | - |
| LCP → Render Delay | N/A | N/A | - |
| Performance Score | 99 | 99 | = |
| SEO Score | 92 | 92 | = |
| Accessibility Score | 80 | 80 | = |
| Best Practices Score | 100 | 100 | = |
LLM Understanding (Claude Opus 4.5)
How efficiently Claude Opus 4.5 understands the codebase. Based on exploration + validation tests.
| Metric | Nuxt 4 | Fastify + React | Winner |
|---|---|---|---|
| Exploration Time | 3958ms | 3580ms | ▶ |
| Exploration Tokens | 5681 | 3244 | ▶ |
| Files Examined | 11 | 10 | ▶ |
| Validation Accuracy | 86% | 80% | ◀ |
| Time Per File | 360ms | 358ms | ▶ |
| Tokens Per File | 3488 | 3060 | ▶ |
| Efficiency Score | 24.39 | 27.95 | ▶ |
LLM Understanding (Claude Haiku 4.5)
How efficiently Claude Haiku 4.5 understands the codebase. Based on exploration + validation tests.
| Metric | Nuxt 4 | Fastify + React | Winner |
|---|---|---|---|
| Exploration Time | 2493ms | 1869ms | ▶ |
| Exploration Tokens | 5707 | 3278 | ▶ |
| Files Examined | 11 | 10 | ▶ |
| Validation Accuracy | 82% | 68% | ◀ |
| Time Per File | 227ms | 187ms | ▶ |
| Tokens Per File | 3482 | 3061 | ▶ |
| Efficiency Score | 32.06 | 26.22 | ◀ |
Build Metrics
| Metric | Nuxt 4 | Fastify + React | Winner |
|---|---|---|---|
| Bundle Size (JS) | 252.2KB | 283.6KB | ◀ |
| Bundle Size (CSS) | 5.3KB | 23.1KB | ◀ |
| Build Time | 0s | 0s | = |
| Dependencies | 10 | 21 | ◀ |
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