How Full Page Cache Impacts Magento 2 Server Response Time

Server response time is a crucial performance metric that directly affects user experience, SEO rankings, and conversion rates. One of the most effective ways to reduce this response time in Magento 2 is by leveraging Full Page Cache (FPC). But how exactly does it work, and what impact does it have?

What Is Full Page Cache in Magento 2?

Full Page Cache (FPC) in Magento 2 is a performance optimization feature that stores the entire HTML content of a page so it can be delivered quickly to users without the need to dynamically generate it every time. When FPC is enabled, Magento saves a fully rendered version of a page to cache after the first load.

Subsequent visits to that page are then served from this cached version, significantly reducing the load on the server and speeding up response time. Without FPC, Magento must execute PHP code, fetch data from the database, and assemble the page layout for each request — a process that is resource-intensive and time-consuming.

FPC streamlines this by bypassing backend processing for cached pages, enabling much faster load times and a smoother user experience.

Full Page Cache is one of the most impactful performance features in Magento 2. By reducing the need to build pages dynamically, it significantly cuts down server response time, improves TTFB, and delivers a smoother experience for your users.

For detailed blog :
https://meetanshi.com/blog/reduce-initial-server-response-time-in-magento-2/