末字节响应时间 (TTLB) 度量末字节的响应时间，指向服务器发送请求与接收到响应的最后一个字节之间的时 首字节响应时间 (TTFB) 度量首字节的响应时间，指向服务器发送请求与接收到响应的第一个字节之间的时间。
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TTFB (or Time to first byte) is the duration from the initial network request being initiated by the browser to the first byte being received from the server.
是浏览器的初始化到从服务器接收到的第一个字节的时间。
TTFB (or Time To First Byte) is the duration from the initial network request being initiated by the browser to the first byte being received from the server.
从响应的第一个字节开始，到把响应接收完为止的时间。
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