How to fix low performance score on Webflow

Steps for Webflow

1. Webflow serves assets via Fastly CDN with GZIP — core delivery is handled; focus on asset optimisation and JS.
2. Optimise images: in Webflow Designer, select each Image element → Asset panel → re-upload WebP versions; enable 'Lazy load' in element Settings panel for all below-the-fold images.
3. Set explicit width and height on all images to prevent CLS: in the Designer, set fixed dimensions or use intrinsic sizing in Style panel.
4. Audit custom code and third-party embeds: Project Settings → Custom Code (site-wide head/footer) and Page Settings → Custom Code (page-level) — remove any unused scripts; move non-critical scripts to Before </body> and add defer attribute.
5. Minimise interactions and animations: heavy Webflow Interactions (GSAP-based) on mobile are a leading cause of high Total Blocking Time — audit via Designer → Interactions panel and remove or simplify any page-load triggers.
6. Use Webflow's Asset Manager to compress fonts — or switch to system fonts for body text to eliminate font-loading delay.
7. Re-publish the site after changes: Designer → Publish, then re-test with PageSpeed Insights.

What is low performance score?

The Lighthouse Performance Score (shown in Google's PageSpeed Insights tool) is a single number from 0–100 that summarises how fast your web page loads and responds for real users — especially on mobile. It is calculated from five timing metrics, with the three Core Web Vitals (Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift) carrying the most weight. A score below 50 is considered "Poor" by Google; a score above 90 is "Good." Think of it as a health-check report card for your page's speed: every point you gain means real customers are waiting less and leaving less.

Google officially uses page experience signals — including Core Web Vitals — as a ranking factor, meaning a very low score can directly suppress your position in search results and reduce organic traffic. Beyond rankings, a slow page destroys conversions: industry data consistently shows that each additional second of load time drops conversion rates by 10–20 %, and mobile shoppers are the most sensitive. A score of 8/100 on mobile means the vast majority of your mobile visitors are likely bouncing before they even see your products, costing you both ad spend and organic sales. Closing this gap is one of the highest-ROI technical improvements an ecommerce store can make.

See the complete Low performance score guide for every platform and the full background.