In this article, the author explains how to improve the performance of a PHP web application using Memcached caching. The application aggregates blog data from Markdown files with YAML frontmatter, which results in an inefficient process due to file system reads on every request. To address this, the author refactors the application's code to use Memcached caching, allowing for more efficient execution and reduced page load times. The refactoring involves serializing the `BlogItem` entity to make it cacheable, updating the `ContentAggregatorFilesystem` class to store aggregated data in Memcached, and integrating the Memcached service into the DI container. With these changes, the application's performance is improved by at least 47%, enabling it to handle more users and reduce hosting costs.