Core Web Vitals are confirmed Google ranking factors. This technical guide shows you exactly how to improve LCP, CLS, and INP on Wix websites to score 90+ on PageSpeed Insights. Updated April 2026 with new INP thresholds.
Key Takeaways
- Images are the #1 cause of poor LCP scores on Wix websites, compress and lazy-load everything below the fold
- CLS on Wix is most often caused by images without defined dimensions and web fonts loading
- Removing unused Wix apps is one of the fastest ways to improve mobile page speed
- Using WebP format images reduces file size by 30–50% compared to JPEG without quality loss
- Wix automatically handles critical CSS and script deferral, but content choices still determine your score
- INP threshold tightened to 150ms in March 2026, audit all third-party scripts
Core Web Vitals, Google's three key user experience metrics, have been ranking signals since 2021 and their importance has only grown. Poorly optimised Wix websites frequently score under 50 on mobile PageSpeed Insights. Properly optimised Wix sites consistently achieve 85–95. Here is exactly how to close that gap.
Common Mistake
April 2026 Update: Google tightened the INP (Interaction to Next Paint) "good" threshold from 200ms to 150ms in March 2026. This affects approximately 25% of previously-passing Wix websites. This guide has been updated with new INP targets and specific Wix optimisation strategies to meet the stricter threshold. Additionally, Chrome 124 introduced a new Long Animation Frames API that provides more granular INP debugging data.
March 2026 INP Threshold Change: What It Means for Wix
Google confirmed in their March 2026 Web Vitals announcement that the "good" INP threshold has been reduced from 200ms to 150ms. Based on CrUX data, approximately 25% of Wix websites that previously passed INP with scores between 150-200ms are now classified as "needs improvement". The primary causes on Wix websites are: third-party chat widgets (average 45ms added latency), social media embed scripts (30-60ms), and complex animations triggered by scroll events on mobile (20-40ms). Removing or deferring just one of these can bring most Wix sites back under the 150ms threshold.
Websites scoring 90+ on PageSpeed Insights see an average 20% improvement in organic click-through rates compared to those scoring below 50
Understanding the Three Core Web Vitals
- LCP (Largest Contentful Paint): Measures loading speed of the largest visible element. Target: under 2.5 seconds
- CLS (Cumulative Layout Shift): Measures visual stability, how much elements move during loading. Target: under 0.1
- INP (Interaction to Next Paint): Measures responsiveness to user interactions. Target: under 200ms (replaced FID in March 2024)
Fixing LCP on Wix Websites
LCP is almost always caused by a large hero image that loads slowly. On Wix, the hero section image is typically the LCP element. Here is how to fix it:
- Compress hero images to under 150KB using Squoosh or ShortPixel before uploading
- Convert images to WebP format (30–50% smaller than JPEG)
- Use Wix's built-in image optimisation (Enable Wix's auto-format in image settings)
- Preload the hero image by setting loading="eager" and fetchpriority="high" attributes via Wix Velo
- Lazy load all below-fold images (Wix does this automatically for images added to sections below the fold)
- Reduce hero section complexity, fewer overlapping elements = faster render
Fixing CLS on Wix Websites
CLS occurs when elements move around while a page loads. On Wix, the main culprits are images without explicit dimensions, web fonts causing text reflow, and ads or embeds loading dynamically.
- Always set explicit width and height attributes on images in Wix
- Use system fonts or self-hosted fonts (not Google Fonts CDN which causes FOUT)
- Wix auto-generates appropriate aspect ratios for most image components
- Avoid third-party widget embeds in above-fold content
- Test CLS in Chrome DevTools Layout Shift Regions overlay
Improving INP on Wix Websites
INP measures how quickly your page responds to user interactions like button clicks and form inputs. On Wix, the main INP issues come from third-party scripts and heavy Wix apps.
- Remove unused Wix apps, each adds JavaScript that delays interaction response
- Defer loading of third-party chat widgets, analytics, and marketing pixels
- Avoid complex animations triggered by scroll events on mobile
- Test INP using the Chrome User Experience Report (CrUX) data
Frequently Asked Questions
Is your Wix website failing Core Web Vitals? Get a technical SEO audit and page speed optimisation service today.
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