When a website hits the front page of a major social platform or search engine, a poorly configured web server will crash. Nginx is revered for its speed, but the default configuration is conservative. Here is how you tune it for massive loads.
Inside nginx.conf, set worker_processes auto;. This binds workers directly to the number of CPU cores available. Then, increase worker_connections inside the events block to something high like 1024 or 4096, depending on your system limits.
Gzip reduces the size of your HTML, CSS, and JS files by up to 80% before they are sent over the network. This saves massive amounts of bandwidth and radically improves load times for end users.
If you are routing traffic through PHP-FPM, configure FastCGI cache. By caching the generated HTML output of dynamic pages for even just 1 to 5 seconds, you can serve thousands of concurrent users static content instead of forcing your database and PHP workers to recreate the page every single time.
Combining these tweaks converts Nginx from a great web server into an absolute powerhouse capable of handling enterprise workloads.