Overview
| Parameter | Nginx | OpenLiteSpeed |
|---|---|---|
| Architecture | Event-driven | Event-driven |
| PHP Processing | FastCGI (PHP-FPM) | LSCAPI (LSAPI) |
| Management | Config files (CLI) | Web GUI / Config files |
| .htaccess Support | No | Yes (Rewrite rules only) |
| HTTP/3 (QUIC) | Yes (since 1.25.0) | Yes (native support) |
| Caching | FastCGI Cache / Proxy Cache | LSCache (built-in module) |
Nginx is a high-performance open-source HTTP server and reverse proxy. It uses an asynchronous architecture to handle connections. OpenLiteSpeed (OLS) is the open-source version of the commercial LiteSpeed Web Server, featuring an optimized engine for dynamic content and a built-in web administration panel.
Performance
Nginx demonstrates consistently low memory consumption when handling hundreds of thousands of concurrent static connections. However, when processing PHP via FastCGI, there is overhead in data transfer between processes. OpenLiteSpeed uses the LSCAPI protocol, which is more efficient than FastCGI. In WordPress benchmarks, OpenLiteSpeed processes up to 5 times more requests per second (RPS) due to tight integration with LSCache and no need for third-party caching modules. Data: Nginx with PHP-FPM on standard settings delivers about 200-300 RPS on a medium VPS, while OLS with LSCache enabled can reach 1500+ RPS on the same hardware.
Configuration & complexity
Nginx configuration is built on hierarchical text files. Basic block example:
server {
listen 80;
server_name domain.com;
location / { root /var/www/html; }
}Any change requires a syntax check nginx -t and a reload systemctl reload nginx. OpenLiteSpeed offers a WebAdmin GUI on port 7080. This simplifies setup for users not used to CLI. Key difference: OLS reads .htaccess rules, but unlike Apache, it doesn't do so dynamically—a server restart is required after file changes. Nginx completely ignores .htaccess, requiring rules to be converted to its own format.
When to choose what
- Nginx: Ideal for microservices architecture, as an API Gateway, Load Balancer, or for React/Vue/Angular frontends. It is the standard for Docker containers and K8s (Ingress Nginx).
- OpenLiteSpeed: The optimal choice for monolithic CMS (WordPress, Magento, Joomla, PrestaShop). If a project heavily relies on PHP and requires maximum speed without complex Varnish or Redis setups, OLS is more effective.
Cost / licensing
Nginx is distributed under the BSD (2-clause) license. There is a commercial version, Nginx Plus, with advanced balancing and monitoring features. OpenLiteSpeed is distributed under the GPL v3 license. The main limitation of OLS compared to the paid LiteSpeed Enterprise version is the lack of full compatibility with control panels like cPanel/Plesk and the lack of dynamic .htaccess reading without a restart.
Ecosystem & integrations
Nginx has a massive community. There are thousands of ready-made modules (Lua, PageSpeed, ModSecurity). Integration with CI/CD pipelines via Ansible/Terraform is standard practice. The OpenLiteSpeed ecosystem is smaller, but it offers unique caching plugins (LSCache) for all popular CMSs that manage cache at the application level, which is not available in Nginx out of the box without complex header configuration.
Verdict
Choose Nginx if you need a versatile tool for infrastructure, traffic balancing, and containerized environments. Choose OpenLiteSpeed if your goal is the fastest possible hosting for WordPress or other PHP applications with minimal cache administration effort.