Google to start using INP

The upcoming shift from FID to INP in March 2024 is a significant milestone in the evolution of web performance metrics.

Embracing the Future of Web Performance: INP Replacing FID in March 2024

As we move forward in the digital age, website performance, and user experience continue to be at the forefront of web development. Google's Core Web Vitals, a set of metrics designed to measure a website's health and usability, are evolving. Come March 2024, the web development community will witness a significant shift: the introduction of Interaction to Next Paint (INP) as a Core Web Vital, replacing the First Input Delay (FID).

The Limitations of FID

First Input Delay (FID) has been a crucial metric in assessing a website's responsiveness. It measures the time from a user's first interaction with a page (like a click or a tap) to the time when the browser is able to respond to that interaction. While FID has been instrumental in highlighting initial interaction delays, it doesn't fully encapsulate the range of interactions a user may have with a page.

Why INP is a Game-Changer

Interaction to Next Paint (INP) is set to take the baton from FID, offering a more comprehensive understanding of user interactions. INP measures the delay of all interactions a user has with a page during their entire visit, not just the first one. This broader scope makes INP a more holistic and accurate reflection of a user's experience on a website.

Benefits of INP Over FID

Comprehensive Interaction Measurement: Unlike FID, which only considers the first input, INP assesses the responsiveness of all user inputs during the entire lifespan of the page. This provides a more complete picture of the site's interactivity and responsiveness.

Enhanced User Experience Insights: By capturing a wider range of interactions, INP helps developers understand and improve areas where users might be experiencing delays or issues, leading to a smoother, more enjoyable user experience.

Greater Relevance to Dynamic Websites: Modern websites often have complex and dynamic interfaces. INP is better suited to measure the performance of these kinds of websites, offering more relevant and actionable insights.

Preparing for the Change

As INP prepares to replace FID in the Core Web Vitals suite, web developers and site owners should start familiarizing themselves with this new metric. Analyzing current website performance with an eye towards INP will be crucial in ensuring a smooth transition. This includes optimizing for more efficient handling of user inputs and ensuring quick visual feedback for all interactions.


The upcoming shift from FID to INP in March 2024 is a significant milestone in the evolution of web performance metrics. It reflects the ongoing commitment to enhancing user experience and adapting to the ever-changing landscape of web technology. As developers and website owners, embracing INP will not only help us stay ahead in the performance game but also ensure that our websites meet the highest standards of user satisfaction and engagement.


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