Next.js 16 vs SvelteKit 2
Real-world performance comparison based on identical SaaS dashboard implementations.
Next.js 16
VPS (Bun)
The React meta-framework running on Bun runtime. Built by Vercel, Next.js supports SSR, SSG, ISR, and streaming—all configured per-route. This variant uses Bun runtime for potentially faster startup times and request handling. The App Router architecture brings React Server Components, nested layouts, and Server Actions. While Bun support for Next.js is unofficial, it works in practice and offers a comparison point for runtime performance. Ideal for teams wanting to benchmark Node.js vs Bun performance with their Next.js applications.
Performance Metrics
Lower is better for all metrics. Green indicates the faster framework.
| Metric | Next.js 16 | SvelteKit 2 | Winner |
|---|---|---|---|
| TTFB (p50) | 0ms | 18.25ms | ◀ |
| TTFB (p95) | 0ms | 20.75ms | ◀ |
| LCP (p50) | 0ms | 42ms | ◀ |
| LCP (p95) | 0ms | 44ms | ◀ |
| CLS | 0 | 0 | = |
| TBT | N/A | 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 | N/A | 99 | - |
| SEO Score | N/A | 83 | - |
| Accessibility Score | N/A | 86 | - |
| Best Practices Score | N/A | 100 | - |
LLM Understanding (Claude Opus 4.5)
How efficiently Claude Opus 4.5 understands the codebase. Based on exploration + validation tests.
| Metric | Next.js 16 | SvelteKit 2 | Winner |
|---|---|---|---|
| Exploration Time | N/A | N/A | - |
| Exploration Tokens | N/A | N/A | - |
| Files Examined | N/A | N/A | - |
| Validation Accuracy | N/A | N/A | - |
| Time Per File | N/A | N/A | - |
| Tokens Per File | N/A | N/A | - |
| Efficiency Score | N/A | N/A | - |
LLM Understanding (Claude Haiku 4.5)
How efficiently Claude Haiku 4.5 understands the codebase. Based on exploration + validation tests.
| Metric | Next.js 16 | SvelteKit 2 | Winner |
|---|---|---|---|
| Exploration Time | N/A | N/A | - |
| Exploration Tokens | N/A | N/A | - |
| Files Examined | N/A | N/A | - |
| Validation Accuracy | N/A | N/A | - |
| Time Per File | N/A | N/A | - |
| Tokens Per File | N/A | N/A | - |
| Efficiency Score | N/A | N/A | - |
Build Metrics
| Metric | Next.js 16 | SvelteKit 2 | Winner |
|---|---|---|---|
| Bundle Size (JS) | 642.6KB | 1066.3KB | ◀ |
| Bundle Size (CSS) | 23.4KB | 70.1KB | ◀ |
| Build Time | 0s | 7.6s | ◀ |
| Dependencies | 19 | 19 | = |
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