Optimizing PHP Performance: Why PHP-FPM Outperformed FrankenPHP and Caddy for 1K Real-Time Users

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When it comes to building scalable web applications, backend performance plays a critical role in user experience. I recently ran a series of benchmarks to determine the best PHP runtime environment for handling 1,000 concurrent users in real-time.

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We tested three different setups:

  • FrankenPHP – a modern, experimental PHP runtime built on top of Caddy.
  • Caddy + PHP-FPM – combining the performance of Caddy as a web server with PHP-FPM.
  • Apache + PHP-FPM – the more traditional stack using PHP-FPM with Apache.


Test Setup

  • Server Specs: 16 CPU cores, 40GB RAM.
  • Database: MySQL 8 with optimized innodb_buffer_pool_size and caching parameters.
  • Load Testing Tool: ApacheBench (ab) and wrk for simulating 1k concurrent users.
  • Codebase: A real-world PHP project with sessions and database queries.


FrankenPHP Results

FrankenPHP is lightweight and very fast in single-core tests. However, under high concurrency (1k users), CPU usage spiked up to 1500%, which made resource usage unpredictable. While it handled requests quickly, the stability wasn’t consistent in production-like conditions.

Pros:

  • Easy to run via Caddy.
  • Built-in support for modern features.

Cons:

  • High CPU overhead under heavy concurrency.
  • Experimental – not yet production-proven for enterprise workloads.


Caddy + PHP-FPM Results

Caddy provided simplicity in configuration, automatic HTTPS, and good load distribution. Combined with PHP-FPM, it was stable – but still slightly less efficient compared to Apache with PHP-FPM in our tests.

Pros:

  • Modern and easy configuration.
  • Good TLS handling out of the box.

Cons:

  • Higher latency compared to PHP-FPM on Apache.
  • PHP worker handling not as efficient.


Apache + PHP-FPM Results

PHP-FPM with Apache showed the best balance of CPU usage, memory consumption, and request throughput. Under 1k concurrent users, CPU usage capped around 500%, which is significantly lower than FrankenPHP’s 1500%.

Pros:

  • Stable and predictable under heavy load.
  • Mature ecosystem, widely documented.
  • Tunable via pm.max_children, opcache, and Redis sessions.

Cons:

  • Slightly higher memory footprint than Caddy.


Final Verdict: PHP-FPM Wins

After extensive testing, PHP-FPM proved to be the most reliable and performant solution for handling 1,000 real-time users. While FrankenPHP and Caddy are exciting technologies with modern benefits, PHP-FPM remains the production-grade choice for high-concurrency environments.

If you’re aiming for real-time scalability with thousands of users, optimizing PHP-FPM + database tuning + Redis session handling is still the safest and most efficient path forward.


I recommend starting with PHP-FPM for mission-critical applications, while keeping an eye on FrankenPHP and Caddy as they evolve.

Tags PHP performance PHP-FPM vs Caddy FrankenPHP benchmark optimize 1k users web performance tuning WebifyGo
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