How to fix cwv lcp on PrestaShop
Reduce Largest Contentful Paint (LCP) to under 2.5 seconds by serving the hero image in a next-gen format (WebP/AVIF), preloading it, and eliminating render-blocking resources.
Steps for PrestaShop
- Convert your hero/slider images to WebP and upload them via Back Office → Design → Image Slider (or your installed slider module, e.g., ps_imageslider).
- Install the 'psgdpr' or a dedicated performance module like 'PrestaSEO Speed' or 'Krona SEO & Speed' from the PrestaShop Addons marketplace to handle JS/CSS minification and deferral.
- Edit your theme's header.tpl (themes/YourTheme/templates/_partials/head.tpl) to add: <link rel='preload' as='image' href='{$hero_image_url}' fetchpriority='high'>.
- In the slider module settings, ensure the first slide image does NOT have lazy loading enabled.
- Enable PrestaShop's built-in CCC (Combine, Compress, Cache) settings: Back Office → Shop Parameters → General → CCC → enable for CSS and JS.
- Clear the cache (Advanced Parameters → Performance → Clear cache) and verify with PageSpeed Insights.
What is cwv lcp?
Largest Contentful Paint (LCP) measures how long it takes for the biggest visible element on your page — almost always the hero image or banner — to fully appear in a visitor's browser. Google considers a "good" LCP anything under 2.5 seconds. An LCP of 9+ seconds means shoppers are staring at a blank or partially loaded page for nearly ten seconds before they see your main content. LCP is one of Google's three Core Web Vitals, which are direct ranking signals used in Google Search.
A slow LCP directly hurts your Google rankings because Core Web Vitals are an official page-experience ranking factor — pages with poor LCP can lose positions to faster competitors even with identical content. More critically, research consistently shows that every additional second of load time reduces conversion rates by 2–7%; an LCP of 9 seconds can cost you the majority of mobile visitors who leave before the page even finishes loading. Mobile shoppers are disproportionately affected because mobile connections are slower, and Google indexes the mobile version of your site first. Fixing LCP is one of the highest-ROI technical improvements an ecommerce store can make: faster pages rank higher, bounce less, and convert better.
See the complete Cwv lcp guide for every platform and the full background.
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