Check Your Wix Site Speed
Run a Lighthouse audit on your Wix site and export the full JSON report. Wix has made significant performance improvements in recent years, but individual sites still vary widely — this report shows exactly where your site stands.
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Loading...Common performance issues on Wix sites
These are the issues most frequently found in Wix Lighthouse audits. Your report will tell you exactly which ones apply to your site.
Large JavaScript payload from Wix platform
Wix loads a significant amount of platform JavaScript to power its editor-ready runtime. This contributes to TBT and cannot be fully eliminated, but minimising additional scripts helps considerably.
Wix apps adding blocking scripts
Each Wix App you add to your site can contribute additional JavaScript. Apps like Wix Chat, booking systems, and reviews widgets are common sources of TBT increases.
Images without optimized formats
Wix has improved its image handling, but images uploaded at very high resolutions or added via specific section types may not always be delivered in the optimal format and size.
Cumulative Layout Shift from late-loading sections
Wix's section-based layout system can cause CLS if sections below the fold load in and shift visible content, especially on mobile devices.
Pro tip: In Wix's Site Settings, enable "Turbo" (now called Site Booster) to activate Wix's built-in CDN and caching optimisations. Then use PageSpeed Exporter to re-audit and confirm the improvement in your LCP and TTFB.
Frequently asked questions
How do I check my Wix site speed?
Enter your Wix site URL at speedexporter.com and run a free Lighthouse audit. Wix has improved performance significantly with its Turbo/Site Booster infrastructure, but your report will identify whether third-party app scripts, large images, or Velo code are causing specific Core Web Vitals failures on your site.
What causes poor Core Web Vitals on Wix?
The most common causes are render-blocking scripts from installed Wix apps (especially marketing and chat apps), hero images and backgrounds not served at optimal resolution, and Velo (Wix Dev Mode) code that runs client-side and increases JavaScript parse time. CLS from late-loading Wix sections is also common on mobile.
How do I pass Core Web Vitals on Wix?
In Wix Dashboard under Settings, enable Site Booster (Wix Turbo) to activate CDN and caching. Remove unused Wix apps — each app adding frontend code increases TBT. In Wix image settings, upload images at the exact display size. For Velo developers, defer non-critical code using wixWindow.onReady() instead of running it immediately. Export your full Lighthouse JSON from PageSpeed Exporter and paste it into Claude or ChatGPT for Wix-specific guidance.