Time to First Byte (TTFB) measures the duration between a user's request to a server and the receipt of the first byte of the response. A lower TTFB indicates a more responsive server, contributing to faster page load times and improved user experience.

Factors influencing TTFB include server processing speed, network latency, and the efficiency of server-side applications. Optimizing TTFBinvolves enhancing server performance, utilizing Content Delivery Networks (CDNs), and implementing efficient caching strategies to reduce delays in delivering content to users.

Learn about Key Web Performance Metrics.