Load Speed Issue - Webflow JS

Publishing help Project settings
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Hey all. I’m really struggling to get a decent load speed on a client’s website.

After spending days combing through every aspect I can think of, I duplicated the site. When publishing it to staging (without a custom domain), it loaded instantly. Once I hooked it up to a custom domain (GoDaddy) it immediately went back to a 5 second+ loading time.

I am at a loss. PageSpeed insights says Webflow’s JS script and the Script Evaluation are some of the biggest culprits. It points to a 22Kb image as the culprit for the LCP?

I need help desperately!

Read-only link:
https://preview.webflow.com/preview/humbug-tester?utm_medium=preview_link&utm_source=designer&utm_content=humbug-tester&preview=d4fc0073b94cbbbe911631322b52c28d&workflow=preview

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For anyone having similar issues in the future - my fix was taking out the Google Optimise container from the Site Settings.

This immediately fixed the timing issue.

1 Like
3

Hi , @Cieran_dv

When load speed issues appear, it’s usually helpful to look at what’s happening during page initialization. slow load speed is primarily caused by main-thread blocking, render-blocking scripts, and heavy assets. Addressing these areas will improve Speed Index, FCP, and LCP on both desktop and mobile.

1. CSS optimization

  • Remove unused styles and consolidate repeated classes.
    Minify CSS to reduce render-blocking time and improve Speed Index.

  • Inline critical CSS for above-the-fold content and defer the rest.

2. Image optimization

  • Compress images, export at correct display sizes (Canva/Figma recommended), convert to WebP, and lazy-load below-the-fold images:

Hero Image

3. Fonts and text rendering

  • Slow-loading fonts block text display. Use font-display: swap and limit font weights/styles:

Add this inside custom code:

And ensure:
@font-face {

font-family: ‘YourFont’;

src: url(‘/fonts/your-font.woff2’) format(‘woff2’);

font-display: swap;

}

4. Third-Party Scripts

  • Remove non-essential scripts.

  • Load remaining scripts with defer or async.

Alternatively, if you’d prefer not to manually optimize your site’s performance, third-party tools like Website Speedy can help analyze your Webflow project, identify heavy assets or render-blocking scripts, and highlight factors affecting load speed and responsiveness.

Disclosure : Website Speedy webflow app is a product developed by our team.