Time to first byte

Time to First Byte (TTFB) is a web performance measurement that indicates the duration between a client's request for a resource (like a web page) and the moment the first byte of data is received from the server. It is a critical metric for assessing the responsiveness of a web server and the overall performance of a website. TTFB can be broken down into three main components: 1. **DNS Lookup Time**: The time it takes to resolve the domain name into an IP address.