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How can I achieve better performance for my Webflow website on mobile devices, as it currently has a low score on mobile performance tests compared to desktop performance?

TL;DR
  • Compress and use responsive WebP images with lazy loading enabled.
  • Simplify or remove complex animations and clean up unused styles and components.
  • Limit third-party scripts and font usage, and streamline page structure by reducing nested elements.
  • Customize font sizes for mobile breakpoints and test performance using Lighthouse or PageSpeed Insights.

Your Webflow site's mobile performance may be low due to large assets, excessive interactions, or poor layout practices optimized only for desktop. Here's how to improve mobile performance specifically.

1. Optimize Images for Mobile

  • Use appropriately sized images for mobile breakpoints. Avoid loading large desktop-resolution images on smaller screens.
  • Use WebP format where possible, as it offers better compression.
  • Enable lazy loading for images and videos by checking the “Lazy load” option in the image settings.

2. Reduce Complex Interactions and Animations

  • Simplify interactions on mobile, especially those triggered on scroll or load.
  • Avoid looping animations or interactions that block rendering or cause layout shifts.
  • In Webflow, duplicate interactions and modify them to be less resource-intensive on smaller breakpoints.

3. Clean Up Unused Styles and Components

  • Remove unused classes, components, and styles to reduce CSS payload.
  • Use the Clean Up button in Webflow’s Designer to see unused classes.
  • Audit any third-party embeds or scripts; they often impact mobile performance.

4. Audit Third-Party Scripts and Fonts

  • Limit external fonts; include only the necessary weights/styles.
  • Host fonts locally if needed to avoid loading delays.
  • Defer or remove JavaScript libraries and embeds you’re not actively using.

5. Streamline Page Structure

  • Reduce nesting of layout elements—overuse of div blocks, containers, etc., increases DOM size.
  • Keep the number of elements per page low, especially hidden elements that still load.

6. Use Smaller or Custom Fonts for Mobile

  • Set separate font sizes and styles for tablet and mobile breakpoints.
  • Avoid oversized headings that cause layout shifts (CLS).

7. Test on Real Devices and Tools

  • Use Google PageSpeed Insights or Lighthouse in Chrome DevTools set to mobile emulation.
  • Prioritize First Contentful Paint (FCP) and Largest Contentful Paint (LCP) scores.
  • Check the timeline tab in DevTools to see what's taking longest to load on mobile.

Summary

To improve mobile performance in Webflow, compress and serve responsive images, reduce animations and unused elements, streamline your layout, and audit third-party assets. Tailor your content and styles specifically for smaller screens to ensure optimal speed and usability.

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