How can I fix poor mobile LCP and INP scores on Wix Studio Editor, even after optimising images and removing heavy content?

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Wix Studio Editor

I’m trying to improve my Core Web Vitals, especially on mobile. My site’s Largest Contentful Paint (LCP) is around 5.8s, and Interaction to Next Paint (INP) is 1,800ms, which is marked as poor. I want the site to load quickly and respond quickly, especially the homepage.

I have you already tried:
All images are in AVIF format, under 100 KB each.
No animations, no video backgrounds, no pop-ups.
No external fonts — only default Wix fonts.

  • LCP: 5.8s (Mobile)
  • INP: 1,848ms
  • FCP: 2.6s
  • Speed Index: 18.1s
  • Mobile Performance Score: 43 (from PageSpeed Insights)
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Hi @sk9808111

Hi there! Thanks for sharing detailed metrics — that helps a lot.
You’ve already taken several solid steps (AVIF, no animations, default fonts), which rules out common bottlenecks. But based on your LCP = 5.8s and INP = 1,848ms, here’s a deeper dive and how you can fix these on Wix Studio, with examples where applicable.

Let’s Fix LCP (5.8s) – Largest Contentful Paint

LCP is usually caused by hero images, H1 text, or banners taking too long to render.

  1. Defer Non-Critical Sections Using wixWindow.formFactor
    Avoid loading the entire homepage on mobile instantly. Instead, defer sections not visible above-the-fold.

import wixWindow from ‘wix-window’;
$w.onReady(function () {
if (wixWindow.formFactor === “Mobile”) {
setTimeout(() => {
$w(‘#belowFoldSection’).collapse(); // Hide below-the-fold content initially
}, 0);
}
});

  1. Use Lazy Load for Images with wix
    Make sure LCP image is above-the-fold and loads without lazy. Only other images should be lazy-loaded.

  2. Convert Hero Text to Static HTML (when possible)
    If your H1 or LCP element is dynamic (e.g. from a CMS or using custom fonts), Wix renders it later.
    Workaround: Use a plain text box, no dataset bindings, and place it early in the DOM (top section).
    Avoid using repeater/dataset for any hero content.

After applying these changes, re-test your site in Google PageSpeed Insights to measure improvements in LCP and INP.

Alternative, if you do not want to invest much time on optimizing yourself, you can Try our app, Website Speedy for Wix Website Speedy - load faster | Wix App Market | Wix.com that comes with 14 days free trial. It will do the optimization automatically for you.

(Disclaimer: We are the developer of this app and are happy to answer any questions you may have.)