Article Summary: Web page speed metrics are important measures of how quickly a web page is loading, in order to improve user experience and website performance. Five key metrics that can be used to measure the performance of a web page are Time to First Byte (TTFB), First Contentful Paint (FCP), Time to Interactive (TTI), Cumulative Layout Shift (CLS), and Total Blocking Time (TBT). Each of these metrics is important to track in order to ensure that a web page is loading quickly and efficiently.


Web page speed metrics are important measures of how quickly a web page is loading, to improve user experience and website performance. Several key speed metrics can be used to measure the performance of a web page.

Time to First Byte (TTFB) measures the time it takes for the browser to receive the first byte of data from the server. It is an important metric to measure because it helps identify if the server is responding quickly. If the TTFB is slow, it can indicate that there is a problem with the server, or that the server is overloaded.

First Contentful Paint (FCP) measures the time it takes for the browser to render the first content on the page. This is an important metric to track because it indicates how quickly the user can see the content of the page. If the FCP is slow, it can indicate that the page’s content is too large, or that the page is not optimized for speed.

Time to Interactive (TTI) measures the time it takes for the page to become interactive. It is an important metric to track because it indicates how quickly the user can interact with the page. If TTI is slow, it can indicate that the page is not optimized for speed, or that there are too many elements on the page.

Cumulative Layout Shift (CLS) measures the number of unexpected layout shifts on the page. This is an important metric to track because it indicates how stable the page is. If CLS is high, it can indicate that the page is not optimized for speed, or that there are too many elements on the page that are shifting around. Finally, Total Blocking Time (TBT) measures the total amount of time that the page is blocked from responding to user input. This is an important metric to track because it indicates how quickly the page is responding to user input. If TBT is high, it can indicate that the page is not optimized for speed, or that there are too many elements on the page that are blocking user interactions.

Overall, web page speed metrics are important measures of how quickly a web page is loading, to improve user experience and website performance. The five key metrics discussed in this overview – TTFB, FCP, TTI, CLS, and TBT – are all important metrics to track to ensure that a web page is loading quickly and efficiently.