Interaction to Next Paint (INP) replaced First Input Delay (FID) as a Core Web Vital on March 12, 2024, and it is now Google’s measure of how responsive your site feels. INP matters more than FID did because it measures every interaction on a page, not just the first one, and tracks the full delay until the screen updates. A good INP score is 200 milliseconds or less. Slow INP frustrates users and can weaken your search rankings. Fast interaction times are a build requirement in our Katy, TX web design projects.
Key Takeaways
- INP (Interaction to Next Paint) measures how quickly your site responds to user interactions.
- INP replaced FID (First Input Delay) as a Core Web Vital on March 12, 2024.
- A good INP is 200 ms or less; 200–500 ms needs improvement; above 500 ms is poor (at the 75th percentile).
- INP is more demanding than FID because it measures all interactions and the full response time.
- INP is part of Google’s page experience signals, so responsiveness affects rankings and conversions.
What is INP (Interaction to Next Paint)?
INP, or Interaction to Next Paint, is a Core Web Vital that measures how quickly a web page responds visually after a user interacts with it. When someone clicks a button, taps a link, or types in a field, INP measures the time from that action to the next visual update on screen. A low INP means the page feels snappy; a high INP means it feels sluggish.
INP captures the full interaction, not a fragment. It includes the input delay, the time the browser spends processing event handlers, and the time to paint the next frame. That complete view is what makes it a truer measure of responsiveness.
What are Core Web Vitals?
Core Web Vitals are three metrics Google uses to measure real-world user experience: loading, responsiveness, and visual stability. They are part of Google’s page experience signals, which feed into search ranking. The three are Largest Contentful Paint (LCP) for loading, INP for responsiveness, and Cumulative Layout Shift (CLS) for visual stability.
Each targets a specific frustration. LCP asks whether the main content loaded quickly. CLS asks whether the page jumped around as it loaded. INP asks whether the page reacted promptly when the user tried to do something.
How is INP different from FID?
INP differs from FID in two ways that make it stricter: it measures all interactions, and it measures the complete response time. FID, First Input Delay, only looked at the delay before the browser began processing the very first interaction on a page. It ignored everything after that first touch.
INP closes both gaps. It evaluates every interaction throughout the visit and reports the page’s overall responsiveness, and it measures the entire path from input to the next paint, not just the initial delay. A page could score well on FID and still feel slow on later clicks — INP catches that.
What is a good INP score?
A good INP score is 200 milliseconds or less, measured at the 75th percentile of page loads. That threshold means at least 75% of interactions on the page must complete within 200 ms. Google groups scores into three bands:
- Good: 200 ms or less.
- Needs improvement: 200 ms to 500 ms.
- Poor: above 500 ms.
The 75th-percentile rule matters: you are judged on the experience of most users, not the best case. A site that is fast for some visitors but slow for a quarter of them does not pass.
Why does INP matter for your business?
INP matters because responsiveness affects both rankings and conversions. As a page experience signal, a poor INP can hold back your search visibility, especially where competing pages are otherwise similar. A sluggish page also costs sales directly — users abandon sites that do not react when they click.
The business case is straightforward: a responsive site keeps visitors engaged and converting, while a laggy one loses them before they act. INP turns “the site feels slow” from a vague complaint into a number you can track and improve.
How do you improve your INP score?
Improve INP by reducing the work the browser’s main thread does when a user interacts. Most poor INP scores come from heavy JavaScript that blocks the browser from responding promptly. Lightening that load is the core of the fix.
Common improvements:
- Reduce and optimize JavaScript so the main thread is free to respond.
- Break up long tasks so the browser can react between them.
- Defer non-essential scripts that run on load.
- Minimize third-party scripts, which often cause hidden delays.
- Test on real devices, since mid-range phones reveal problems fast hardware hides.
Start by checking your scores in Google Search Console, then fix the worst pages first. Connect Media Agency builds and maintains fast, responsive WordPress websites with Core Web Vitals in mind.
The Bottom Line
INP replaced FID as a Core Web Vital on March 12, 2024, and it is the stricter, more honest measure of how responsive your site feels — it watches every interaction and the full delay until the screen updates. Aim for 200 ms or less at the 75th percentile. Because INP feeds Google’s page experience signals and affects whether visitors convert, treat it as both a ranking factor and a user-experience priority.
Connect Media Agency builds and maintains high-performance WordPress websites. This article is general information, not a guarantee of specific rankings.
