Google Introduces New Metric to Core Web Vitals

Interaction to Next Paint: Core Web Vitals screenshot

In the ever-evolving world of web development and user experience, Google is constantly striving to improve the performance and usability of websites. As part of their ongoing efforts, Google has introduced a new metric called Interaction to Next Paint to Core Web Vitals, replacing the existing metric known as First Input Delay. This change aims to provide a more comprehensive understanding of website responsiveness and user interaction, ultimately enhancing the overall user experience. In this article, we will explore what this update entails and how it benefits both website owners and visitors.

Understanding Core Web Vitals

In early 2020, Google's Chrome Team introduced the Core Web Vitals to provide a suite of quality signals for web pages. Core Web Vitals are a set of essential metrics that Google uses to measure and assess the performance and user experience of websites. These metrics are crucial in determining a website's search ranking and its ability to deliver a smooth and engaging browsing experience. Until now, one of the key metrics included in Core Web Vitals was First Input Delay, which measured the time delay between a user's first interaction with a web page and the browser's response to that interaction. However, there were known limitations of First Input Delay which have been extensively covered in the web development community.

Introducing Interaction to Next Paint

To enhance the accuracy of user experience evaluation, Google has replaced First Input Delay with a new metric called Interaction to Next Paint. The new metric, INP, will replace FID as part of the Core Web Vitals in March 2024. To help site owners and developers to take the necessary steps and evaluate their pages for the new metric, Search Console will include INP in the Core Web Vitals report later this year. When INP replaces FID in March 2024, the Search Console report will stop showing FID metrics and use INP as the new metric for responsiveness. 

This updated metric focuses on measuring the time it takes for a web page to become visually interactive after a user initiates an action throughout the lifespan of a user’s visit to a page. It considers the duration between the user's input and the next significant visual change on the screen, such as the appearance of new content or an updated interface element.

Benefits of the New Metric

The introduction of "Interaction to Next Paint" brings several benefits to both website owners and users:

Comprehensive User Experience Evaluation

By considering the time it takes for a website to respond visually after a user interacts, the new metric provides a more holistic assessment of the user experience. It captures the entire spectrum of user interaction, from input to visual feedback, ensuring a more accurate representation of the website's responsiveness as a whole rather than a first interaction that is currently measured.

Real-World User Scenarios

Interaction to Next Paint aligns with real-world scenarios and Google’s user-experience push where users expect immediate visual feedback upon interaction. This metric emphasises the importance of delivering a seamless and responsive experience, allowing website owners to identify and address any bottlenecks that hinder quick visual updates.

Enhanced User Engagement and Satisfaction

A fast and visually responsive website fosters better user engagement and satisfaction. By focusing on reducing the time it takes for a web page to become visually interactive, website owners can create a more immersive and enjoyable experience for their visitors, increasing the likelihood of longer sessions, repeated visits, and conversions.

What Will Be a Good INP Score?

From the current Core Web Vitals traffic lighting system we know that pinning labels such as "good" or "poor" on a responsiveness metric is difficult. 

Google states “to ensure you're delivering user experiences with good responsiveness, a good threshold to measure is the 75th percentile of page loads recorded in the field, segmented across mobile and desktop devices”

Here are the key numbers you need to know:

  • An INP below or at 200 milliseconds means that your page has good responsiveness.
  • An INP above 200 milliseconds and below or at 500 milliseconds means that your page's responsiveness needs improvement.
  • An INP above 500 milliseconds means that your page has poor responsiveness.


Google's introduction of Interaction to Next Paint to Core Web Vitals signifies a significant step forward in evaluating website performance and user experience. By replacing First Input Delay with this new metric, Google emphasises the importance of quick visual feedback and interactive responsiveness not just at first interaction but throughout the entire user journey throughout your site. 

Website owners who begin optimising for "Interaction to Next Paint" will not only improve their search rankings but also provide a more engaging and satisfying experience for their visitors. 

It's crucial to stay updated with these changes and leverage them to create websites that deliver exceptional performance and usability. That's where ICS-digital's expert team of technical SEO specialists and web developers can help.