FID (First Input Delay) and INP (Interaction to Next Paint)
FID (First Input Delay) and INP (Interaction to Next Paint)
First Input Delay (FID) measures how long it takes for the site to become interactable.
Having a good FID score is essential for making a good first impression with new visitors.
RapidSpike allows you to monitor Max Potential FID; the duration of the longest task. This allows you to measure FID from a lab environment. As a result, you can track changes throughout the day before they impact users.
The Max Potential FID for this website changes throughout the day.
A good FID score should be 100 ms or less. A score of 100ms – 300ms is classed as needs improvement and anything above 300ms is classed as poor.
First Input Delay (FID) is being replaced by Interaction to Next Paint (INP) as a Core Web Vital in March 2024.
This measures how quickly users receive visual feedback each time they interact with the page. For example, a customer might add a product to their basket. They might receive an ‘added to basket’ message. This also works for tasks that take longer – instead, a loading page shows the user that something is happening (even if it is not instant).
A loading graphic when searching for flights.
Essentially, a good INP score means that your users can interact with your site and feel like it is doing something in response.