Time to First Byte (TTFB) is a a metric that reports the time between a request for a resource and the first byte arriving to the browser. Learn more in Time to First Byte: What it is and How to Make Improvements.
Time to First Byte is a sum of several request and networking phrases:
Because a slow response time can have a cascading, adverse effect on overall web performance, we recommend optimising Time to First Byte as a priority.
|Good TTFB Measurement||Poor TTFB Measurement|
|≤ 800ms||> 800ms|