Web developers' efforts to speed up page load times on high-traffic portals often run into the technical limitations of traditional caching systems. Traditional proxy servers (such as Varnish or Nginx) are excellent at caching completely static pages, but they struggle if the page contains even one dynamic element unique to each user (for example, a player's name, their current balance in the site header, or a personalized recommendation block). Completely abandoning caching of such pages overloads backend servers, and Edge Side Includes (ESI) offers a microservices-level solution. A detailed analysis of this technology is available at https://luckycaponecasino.com . ESI markup language allows a single web page to be divided into multiple independent fragments, each with its own rules and cache time-to-live (TTL). Instead of requesting the entire page from the main application server, an intermediate CDN caching server assembles it like a mosaic. Static blocks (navigation menu, footer, game catalog) are taken from the fast RAM cache, and dynamic elements are replaced with special ESI tags that send lightweight, targeted requests to the backend to retrieve up-to-date data for a specific user.
