Nginx Performance Optimization Techniques

Nginx is a high‑performance web server widely used on the Internet. Under high concurrency and traffic, tuning is essential to maintain efficiency.

This article introduces several optimization methods.

1. Adjust worker processes and connections

The number of worker processes is set by the worker_processes directive. Example:

worker_processes 4;

The maximum connections per worker are controlled by worker_connections :

worker_connections 1024;

Choose values that match the server’s CPU cores and expected load.

2. Enable Gzip compression

Install the gzip module when compiling Nginx, then add the following to the http block:

http {
...
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
...
}

3. Configure caching strategies

Set browser cache headers using Expires and Cache‑Control :

location ~* \.(jpg|jpeg|gif|png|css|js)$ {
add_header Cache-Control "public, max-age=31536000";
}

For reverse‑proxy caching, use proxy_cache_valid :

location / {
proxy_pass http://backend;
proxy_cache mycache;
proxy_cache_valid 200 302 60m;
proxy_cache_valid 404 1m;
}

4. Optimize file delivery

Enable sendfile to transfer files directly from disk to network:

http {
...
sendfile on;
...
}

Adjust sendfile_max_chunk and tcp_nopush for better throughput:

http {
...
sendfile_max_chunk 1m;
tcp_nopush on;
...
}

5. Tune logging

Set an appropriate log_level , e.g., info :

http {
...
log_level info;
...
}

Configure log rotation and compression to reduce disk usage.

6. Additional recommendations

Use a CDN to cache static assets and enable HTTP/2 for multiplexed, efficient transfers:

server {
listen 443 ssl http2;
...
}