Google Search Central Publishes Latest Mobile SEO Guidance: INP Confirmed as a Core Ranking Factor

Google Search Central Publishes Latest Mobile SEO Guidance: INP Confirmed as a Core Ranking Factor

Google Search Central recently published its latest mobile SEO guidance for 2026, one of the most significant mobile SEO updates since the introduction of Core Web Vitals.

Key Updates

INP Fully Replaces FID

Google has officially confirmed that INP (Interaction to Next Paint) has completely replaced FID (First Input Delay) as the third core metric of Core Web Vitals:

The new guidance specifically notes that INP measures the response latency of all interactions throughout the entire lifecycle of a page, reflecting the interaction experience more comprehensively than FID.

New Dimensions for Evaluating Mobile Performance

The guidance adds a focus on the following areas:

  1. Touch responsiveness: optimizing the handling of touch events
  2. Scroll performance: the use of passive event listeners
  3. Animation smoothness: using CSS transform and opacity instead of layout properties

New Chrome UX Report Data

Google announced an update to the mobile data dimensions of the Chrome User Experience Report (CrUX), which will provide more fine-grained device-tier data (low-end devices, mid-range devices, high-end devices).

The Real-World Impact on SEO

Impact on Rankings

According to Google's announcement, the Core Web Vitals ranking signal remains unchanged—but INP is now one of its components:

Situations That Require Immediate Action

If your site's INP exceeds 500ms on mobile, this is a high-priority issue that requires immediate action:

  1. Use the Chrome DevTools Performance panel to identify long tasks
  2. Use the PerformanceObserver API to monitor INP
  3. Consider code splitting and deferring the execution of non-critical JS

How to Measure and Improve INP

Recommended Tools

// 使用web-vitals库实时监控INP
import { onINP } from "web-vitals";

onINP((metric) => {
  console.log("INP:", metric.value, "ms");
  // 发送到你的分析平台
  gtag("event", "web_vitals", {
    event_category: "Web Vitals",
    event_action: metric.name,
    event_value: Math.round(metric.value),
    non_interaction: true
  });
});

Industry Response

Several SEO tool vendors have already updated their products to incorporate INP into their mobile health scores. Ahrefs, SEMrush, and Screaming Frog have all released updates supporting the tracking and reporting of INP data.

Reportedly, in response to this update, some e-commerce sites built on React/Vue single-page applications have begun urgently optimizing their INP, as interaction delays for cart operations and filtering features are commonly on the high side.

Conclusion

The key change for mobile SEO in 2026: INP becomes a core metric, and mobile performance standards are raised further. We recommend that all website operators check their INP data immediately and develop a plan for improvement.