Time to First Byte (TTFB)

Retrieving DNS information is the first of many steps involved in loading a webpage. Next, the browser and server need to establish a connection. Once the connection is established, the browser sends the server details about the webpage visitors requested and the server starts building the necessary files to fulfill the visitor's request. As the files are prepared, the server sends the files for this webpage to the browser one byte at a time. Visitors, meanwhile, see a blank screen while the browser and server do this work.