Check Your Webflow Site Speed
Run a Lighthouse audit on your Webflow site and get the full JSON performance report. Webflow handles a lot automatically, but these reports reveal exactly which custom code or design decisions are slowing you down.
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Loading...Common performance issues on Webflow sites
These are the issues most frequently found in Webflow Lighthouse audits. Your report will tell you exactly which ones apply to your site.
Third-party script bloat
Custom code sections in Webflow are a common source of render-blocking scripts. Analytics, live chat, and marketing pixels can significantly impact LCP.
Large hero images
Webflow's visual editor makes it easy to add large, beautiful images — but without explicit dimensions and loading priority set, the hero image often becomes the LCP bottleneck.
Custom font loading
Webflow loads fonts from its CDN, but if you're using custom fonts, they may block text rendering and contribute to poor FCP and LCP if not preloaded.
Interaction and animation overhead
Heavy Webflow Interactions that run on page load can increase Total Blocking Time and cause layout shifts if not properly configured.
Pro tip: Webflow automatically serves images in WebP format and has built-in lazy loading, but you're still responsible for setting correct image dimensions to prevent CLS. Always set explicit width and height on images in the Webflow editor.
Frequently asked questions
How do I check my Webflow site speed?
Enter your Webflow site URL at speedexporter.com and run a free Lighthouse audit. Webflow handles most infrastructure automatically, but your report will surface issues caused by custom code, large images, or third-party scripts that Webflow cannot control.
What causes slow performance on Webflow sites?
The most common issues are custom code embeds that load third-party scripts synchronously in the head section, large uncompressed hero images (Webflow does not always auto-add explicit dimensions needed to prevent CLS), and Webflow Interactions that run on page load and increase Total Blocking Time.
How do I improve Core Web Vitals on Webflow?
Move custom code embeds from the head to the body where possible, or add defer to scripts you control. In the Webflow Image Settings panel, always set explicit dimensions for hero images. Remove Webflow Interactions that trigger on page load unless essential. Export your Lighthouse JSON from PageSpeed Exporter and paste it into Claude to get Webflow-specific embed code fixes.