Google May Replace FID With INP

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At Google I/O last week, Google’s Annie Sullivan and Michal Mocny introduced a new metric named INP or Interaction to Next Paint. INP measures overall responsiveness to user interactions on the page and it may or may not replace FID, First Input Delay, as a Core Web Vitals metric.

I know a lot of SEOs obsess about Core Web Vitals, despite it not being an even subtle ranking signal, but because it is easy to sell and actually does benefit users and conversions. So I felt it is important to finally cover what is going on with INP, Interaction to Next Paint, and Core Web Vitals.

To be clear, nothing has changed yet with Core Web Vitals and INP is very much in the experimental phase. But there is a chance that INP will be added to Core Web Vital and / or replace FID in Core Web Vitals.

This was announced at Google I/O in this session at about 6 minutes in:

Michal said “FID has some fairly large blind spots.” He said “and that’s why we are introducing a new experimental responsiveness metric, Interaction to Next Paint. INP is a full-page lifecycle metric, just like Cumulative Layout Shift. That means it measures all interactions, not just the first. We call that runtime responsiveness to help differentiate from just loading responsiveness. INP measures the whole input latency, from when a user interacts until they actually see a visual response, not just the initial delay on main thread.”

This is about making sure the web site lets you interact with it within a short period of time. The example on the right gives immediate visual feedback that an image is being fetched from the network. This visual feedback underscores the importance of communicating a result of an interaction.

INP is a metric that aims to represent a page’s overall interaction latency by selecting one of the single longest interactions that occur when a user visits a page. For pages with less than 50 interactions in total, INP is the interaction with the worst latency. For pages with many interactions, INP is most often the 98th percentile of interaction latency.

Phil Walton from Google also tweeted about it:

So many SEOs are nervous about it, but Annie Sullivan from Google told us to not worry, we can give feedback in the thresholds and other elements.

Google yesterday wrote a blog post explaining the differences between FID and INP, Glenn Gabe summed it up nicely in these tweets with these screenshots:

Google said “We expect the INP score to provide a better compass for websites to improve responsiveness and performance in the future. We will take steps to provide more actionable guidance on the metric in 2022-23.”

There is also a Twitter Spaces interview with Annie Sullivan where Annie answers a bunch of questions around INP. This includes mentions around Google replacing FID with INP. You can listen to it over here.

INP is something to have on your radar but not to panic about – espesially over SEO concerns.

Forum discussion at Twitter.



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