Boost Your Server: Master Nginx Performance Tuning Essentials

1. worker_processes

Defines how many worker processes Nginx starts; each process handles requests using an event‑driven model. Matching the number of CPU cores avoids CPU contention and context switches. Nginx can auto‑detect cores with worker_processes auto;.

2. worker_connections

Sets the maximum number of simultaneous connections a single worker can open. Increasing this value raises total concurrency; a typical setting is 10240. The theoretical maximum connections equal worker_processes * worker_connections, which may require raising the OS file‑descriptor limit via ulimit -n.

3. Keepalive connections

Enables persistent HTTP connections so a client can send multiple requests over one TCP connection, reducing handshake overhead. Key directives are keepalive_timeout (e.g., 15‑30 s) and keepalive_requests (e.g., 1000). Example:

http {
    keepalive_timeout 20s;
    keepalive_requests 1000;
}

4. Gzip compression

Compresses text‑based responses to save bandwidth and speed up page loads. Enable with gzip on; and set a balanced compression level, e.g., gzip_comp_level 5 or 6. Also configure gzip_min_length 1k and specify MIME types to compress.

http {
    gzip on;
    gzip_comp_level 6;
    gzip_min_length 1k;
    gzip_types text/plain text/css application/json application/javascript;
}

5. Static file transfer optimization

Use sendfile on to let the kernel transfer files directly, achieving zero‑copy. Pair with tcp_nopush on (enabled after sendfile) to combine headers and file data into full packets, improving network efficiency.