Fastify + React vs A La Pieter Levels Stack

Real-world performance comparison based on identical SaaS dashboard implementations.

Fastify + React

Fastify + React

VPS

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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.

A La Pieter Levels Stack

A La Pieter Levels Stack

VPS (PHP)

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The indie hacker's PHP stack popularized by Pieter Levels, creator of Nomad List, Remote OK, and Photo AI. This deliberately simple LAMP-style architecture has powered multiple million-dollar bootstrapped products. No build step, no JavaScript framework, no complex deployment—just PHP files served directly. SQLite for the database, jQuery for interactivity where needed, and vanilla CSS. The entire stack fits in a single developer's head. This approach challenges modern web development complexity. It demonstrates that successful products don't require cutting-edge frameworks—they require shipping. Perfect for solo founders and rapid prototyping.

Performance Metrics

Lower is better for all metrics. Green indicates the faster framework.

Metric Fastify + React A La Pieter Levels Stack Winner
TTFB (p50) 42.95ms 43.8ms ◀
TTFB (p95) 46.06ms 127.08ms ◀
LCP (p50) 70ms 66ms ▶
LCP (p95) 78.2ms 153.4ms ◀
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 96 ◀
SEO Score 92 83 ◀
Accessibility Score 80 79 ◀
Best Practices Score 100 96 ◀

LLM Understanding (Claude Opus 4.5)

How efficiently Claude Opus 4.5 understands the codebase. Based on exploration + validation tests.

Metric Fastify + React A La Pieter Levels Stack Winner
Exploration Time 3580ms 3692ms ◀
Exploration Tokens 3244 4308 ◀
Files Examined 10 8 ▶
Validation Accuracy 80% 86% ▶
Time Per File 358ms 462ms ◀
Tokens Per File 3060 3714 ◀
Efficiency Score 27.95 40.19 ▶

LLM Understanding (Claude Haiku 4.5)

How efficiently Claude Haiku 4.5 understands the codebase. Based on exploration + validation tests.

Metric Fastify + React A La Pieter Levels Stack Winner
Exploration Time 1869ms 1635ms ▶
Exploration Tokens 3278 4330 ◀
Files Examined 10 8 ▶
Validation Accuracy 68% 85% ▶
Time Per File 187ms 204ms ◀
Tokens Per File 3061 3736 ◀
Efficiency Score 26.22 90.21 ▶

Build Metrics

Metric Fastify + React A La Pieter Levels Stack Winner
Bundle Size (JS) 283.6KB 162.8KB ▶
Bundle Size (CSS) 23.1KB 25.9KB ◀
Build Time 0s 0s =
Dependencies 21 0 ▶

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