Time to First Byte is a metric that measures

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The page load won’t be complete, but it will have started. First Input Delay (FID) “FID measures the time from when a user first interacts with a page (that is, when they click a link, tap on a button, or use a custom, JavaScript-powered control) to the time when the browser is actually able to begin processing event handlers in response to that interaction.” What this means for technical SEOs FID is a user interaction responsiveness metric set to be replaced by Interaction to Next Paint (INP) in March 2024.

If a user interacts with an on-page element (i.e., a link, sorting a table, or applying faceted navigation), how long will it take for the site to DB to Data begin processing that request? Interaction to Next Paint (INP) “INP is a metric that assesses a page’s overall responsiveness to user interactions by observing the latency of all click, tap, and keyboard interactions that occur throughout the lifespan of a user’s visit to a page. The final INP value is the longest interaction observed, ignoring outliers.



What this means for technical SEOs As mentioned, INP will replace FID as a Core Web Vital in March 2024. INP factors deeper information (apparently stretching back to the keyboard) and is likely more detailed and sophisticated.  the time between the request for a resource and when the first byte of a response begins to arrive.” What this means for technical SEOs Once a “resource” (i.e., embedded image, JavaScript module, CSS stylesheet, etc.) is requested, how long will it take for the site to begin delivering that resource? Let’s say you visit a webpage, and on that page is an embedded image. It begins to load but hasn’t finished loading yet.