Site speed refers to how quickly a website s pages load and display content to users. It is a critical factor in user experience, search engine rankings, and overall website performance. Site speed is typically measured by metrics such as page load time, time to first byte (TTFB), and the speed index. Faster site speed leads to higher user satisfaction, lower bounce rates, and improved conversion rates, while slow-loading sites can drive visitors away and negatively impact search visibility. Optimizing site speed involves techniques like image compression, code minification, efficient server response, and leveraging browser caching.