Preload Fullpage Cache is a WordPress plugin designed to optimize the performance of high-traffic websites by preloading new posts into the cache. This functionality ensures that when a new post is published, it is immediately available to visitors, effectively handling traffic spikes that occur after publication. The plugin utilizes the WordPress HTTP API to fetch the new post in its desktop, mobile, and AMP versions, thereby facilitating a seamless user experience. It also supports updates to existing posts, ensuring that the latest content is always cached and ready for visitors.

While Preload Fullpage Cache significantly enhances the efficiency of content delivery, it is important to note its limitations. The plugin does not serve as a caching layer itself; users are advised to utilize it alongside established caching solutions like Varnish or WP Super Cache. Additionally, it does not support Custom Post Types and may encounter compatibility issues with LiteSpeed and its associated caching plugin. Overall, this plugin serves as a valuable tool for WordPress users looking to maximize performance during peak traffic times.