Website performance refers to how quickly and efficiently a website loads and operates for users. It encompasses factors such as page load speed, responsiveness, and the smooth execution of interactive elements. High website performance ensures a positive user experience, reduces bounce rates, and can improve search engine rankings. Key metrics used to measure website performance include load time, time to first byte (TTFB), and overall site responsiveness across different devices and network conditions. Optimizing website performance often involves techniques like image compression, code minification, and leveraging browser caching.