As per Chrome UX Report data, around 43% of websites still fail Google’s 200ms INP threshold. And most WordPress site owners don’t know it is hurting their overall search rankings.
In March 2024, Google replaced FID (First Input Delay) with INP (Interaction to Next Paint) as an official ranking signal. Even after two years, many WordPress sites still haven’t addressed it. This leaves performance gaps. And impact SEO & user experience.
This WordPress INP optimization guide explains exactly what the metric measures, why WordPress sites typically fail it, and how to fix it.
It is also why modern WordPress speed optimization goes far beyond fast page loads. It means fixing how your site responds to every single click.
What Is INP (Interaction to Next Paint)?
INP, or Interaction to Next Paint, measures how quickly a webpage visually responds to user interactions. This includes clicks, taps, and keyboard inputs.
- Good: Under 200 milliseconds
- Needs Improvement: 200 – 500 milliseconds
- Poor: Above 500 milliseconds
INP became part of WordPress Core Web Vitals in March 2024, replacing First Input Delay as Google’s standard for measuring page interactivity (web.dev).
These thresholds define whether your site delivers a smooth, responsive experience or frustrates users with lag.
INP is defined and maintained by the W3C Web Performance Working Group, the standards body responsible for web performance metrics.
Why Do WordPress Sites Commonly Fail INP?
Most INP problems on WordPress come from JavaScript running on the browser’s main thread. This is the same thread responsible for rendering, layout, and user interaction handling.
Overloading the main thread affects not just INP but overall WordPress page speed performance. This leads to slower responses, more layout shifts, and poorer user experience.
Common root causes comprise:
- Heavy page builders (Elementor, Divi) loading large JavaScript bundles on every page.
- Multiple plugins each adding their own frontend JavaScript.
- Third-party scripts (chat widgets, ad tags, analytics) blocking the main thread.
- No JavaScript deferral or delay configured.
- Shared hosting with limited CPU unable to process interactions quickly enough.
How to Check Your WordPress INP Score?
Here are the steps to check your WordPress INP Score.
1. Google Search Console → Core Web Vitals report → Shows real-user field data for WordPress Core Web Vitals including INP (Google Search Central).
2. PageSpeed Insights → Enter your URL → Check the “Diagnose performance issues” section for INP score.
3. Chrome DevTools → Performance tab → Interactions panel → Shows INP trace per interaction.
The Google Search Central confirms that Core Web Vitals, including INP, are used as ranking signals in Google Search. Field data from Search Console is what Google actually uses for ranking decisions – lab scores from PageSpeed Insights are secondary.
5 Ways to Improve INP on Your WordPress Site!
Here are the most effective ways to fix your WordPress INP score. They are listed by impact and highest first:
1. Defer non-critical JavaScript – Use WP Rocket, LiteSpeed Cache, or Flying Scripts to delay JavaScript that doesn’t need to execute on initial page load.
2. Audit and reduce your plugin count – Each plugin that injects frontend JavaScript is a potential INP risk; audit quarterly and remove anything unused.
3. Replace heavy page builders – Elementor & Divi load JavaScript overheads. Block-based themes & lighter builders reduce main thread pressure.
4. Enable full-page caching – Reduces server response time, which contributes to perceived interaction latency, especially on shared hosting.
5. Load third-party scripts asynchronously – Google Tag Manager, live chat widgets, and ad scripts run on the main thread by default; load them async or defer them.
For a broader look at every performance lever available on WordPress, from caching to CDN setup – read our complete WordPress speed optimization guide.
Key Takeaway!
In this WordPress INP optimization guide, we explored Google’s Newest Core Web Vitals and how to fix your WordPress INP score.
If your INP score is holding back your rankings, CreedAlly’s WordPress speed optimization service includes a full Core Web Vitals audit and hands-on fixes for INP, LCP, and CLS.
Request a free website assessment today. And make your WordPress site faster, more responsive, & search-ready.
