FID
FID is the acronym for First Input Delay.
First Input Delay
A performance metric that measures the responsiveness of a website or web application to user interactions. Specifically, FID quantifies the delay between the moment a user interacts with a page (e.g., clicking a button or selecting a dropdown) and the time the page responds to that interaction.
FID is crucial because it reflects how quickly a website becomes interactive and responsive to user input. A low FID indicates that the website responds promptly to user actions, providing a smooth and seamless user experience. On the other hand, a high FID suggests a delay in response, which can lead to user frustration and a poor user experience.
FID is measured in milliseconds and is typically reported as the median value of page loads. It is calculated by observing user input events and measuring the time difference between the user action and when the browser’s main thread becomes available to respond to that action.
FID is a part of the Core Web Vitals, a set of essential metrics identified by CrUX to assess and improve web page performance and user experience. The goal is to ensure that websites deliver users fast, reliable, and engaging experiences.
To optimize FID, developers can employ techniques like code optimization, reducing main thread work, deferring non-critical JavaScript, and prioritizing user input responsiveness. By minimizing FID, website owners can enhance user satisfaction and increase platform engagement.
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