How to fix cwv inp on PrestaShop
Reduce Interaction to Next Paint (INP) to under 200 ms by breaking up long JavaScript tasks, deferring non-critical third-party scripts, and lightening event handlers so the page feels fast and responsive after every tap or click.
Steps for PrestaShop
- Go to Back Office → Advanced Parameters → Performance. Enable 'Compress, minify and cache JavaScript' and 'Combine JavaScript files'.
- In Modules → Module Manager, disable or uninstall any front-end module (chat, slider, pop-up) that you are not actively using — each adds JavaScript weight.
- In Back Office → Design → Theme & Logo → Advanced Customisation, identify custom JS files added to the theme. Open them and refactor heavy event handlers to defer work using `setTimeout`.
- Use PageSpeed Insights to identify which specific interactions are slow, then target those handlers in the theme's JavaScript.
What is cwv inp?
Interaction to Next Paint (INP) measures how quickly your page visually responds after a visitor taps a button, opens a menu, or types in a search box — from the moment they interact to the moment the screen actually updates. Google considers anything under 200 ms "good," 200–500 ms "needs improvement," and over 500 ms "poor." INP is now a Core Web Vital, meaning it is part of Google's official page-experience signal that feeds directly into rankings. A high INP score almost always means the browser's main thread is busy running JavaScript and simply cannot get around to updating what the visitor sees for a frustrating fraction of a second (or longer).
Google uses Core Web Vitals — including INP — as a ranking signal, so a poor INP score can quietly suppress your pages in search results compared to faster competitors. Beyond rankings, a sluggish-feeling page directly hurts conversions: studies consistently show that every 100 ms of added interaction delay reduces add-to-cart and checkout completion rates. On mobile, where CPU speed is limited and networks are slower, a 500–800 ms INP is especially damaging because mobile shoppers are the majority of ecommerce traffic. There is also an accessibility dimension — users who rely on keyboard navigation or assistive technology are disproportionately harmed by delayed visual feedback, which can create a frustrating or unusable experience.
See the complete Cwv inp guide for every platform and the full background.
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