INP replaced FID over a year ago, but most sites still haven't adapted. Here's what still matters for ranking in 2026.
Every year someone predicts Core Web Vitals will stop mattering. Every year, it doesn't happen. What has changed is which metric actually moves the needle.
The Metric That Actually Matters Now
Interaction to Next Paint (INP) has fully replaced First Input Delay in Google's field data. Sites are still being penalized for "fast-looking" pages that respond sluggishly to real clicks, especially on mobile.
- Audit your JavaScript execution time, not just your load time.
- Third-party scripts (chat widgets, ad tags) are the most common INP killer.
- Test on real mid-range Android devices, not just your MacBook.
The sites still winning on Core Web Vitals in 2026 are the ones that treat speed as a product feature, not a one-time audit item.
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Category: Technical