Average performance in web performance refers to the typical speed and responsiveness experienced by users when interacting with a website or web application. It is commonly measured by aggregating key performance metrics—such as page load time, First Contentful Paint (FCP), and Time to Interactive (TTI)—across a representative set of user sessions. By calculating the mean or median values of these metrics, developers gain insight into how the majority of users perceive the site's performance, helping to identify areas for optimization and ensure a consistently smooth user experience.