Wix INP optimisation in 2026: reducing Interaction to Next Paint below 200ms

Interaction to Next Paint replaced First Input Delay as a Core Web Vital in March 2024. Many Wix sites still exceed the 200ms Good threshold, particularly on mobile. This lesson covers how to diagnose INP issues specific to Wix, which third-party apps cause the worst scores, and every optimisation available without leaving the platform.

What INP Measures and Why It Replaced FID

First Input Delay measured only the first interaction on a page. Interaction to Next Paint measures the latency of all user interactions throughout the entire page session — clicks, taps, keyboard inputs. A page that feels slow to respond at any point during a visit will have a poor INP score. The 200ms threshold represents the boundary between Good and Needs Improvement in Google's assessment.

Diagnosing INP Issues on Wix

Step-by-step INP diagnosis for Wix sites

• Open Chrome DevTools and navigate to Performance > Core Web Vitals
• Interact with your Wix page (click navigation, buttons, forms) while recording
• Identify interactions with yellow (200-500ms) or red (500ms+) INP scores
• Check the Long Tasks panel to see which scripts are blocking the main thread
• Use PageSpeed Insights and switch to Field Data to see real-user INP from CrUX
• Install Google Chrome's Web Vitals extension for real-time INP monitoring

Wix Apps That Most Commonly Cause High INP

• Live chat widgets (Tidio, Intercom, Drift) that run large JavaScript bundles
• Popup and overlay apps with complex animation handlers
• Review collection widgets with frequent DOM updates
• Booking apps with real-time availability checking on user interaction
• Social media feed embeds with continuous background loading
• Poorly optimised third-party tracking scripts loaded synchronously

Optimisations Available Without Custom Development

• Delay or remove non-essential third-party scripts via Wix Marketing Integrations
• Replace live chat with a simpler contact form during testing periods
• Disable Wix animations on mobile via the Wix editor mobile view
• Reduce the number of active Wix apps — each adds JavaScript weight
• Use the Wix Turbo performance setting (available on higher plans) for preloading
• Compress and resize all images to prevent layout-triggered repaints