Industry-leading performance at the core of every site

eCommerce website featuring a blue watch, overlayed on the site’s javascript, featuring the site's ‘Core Web Vitals’.
Wix's origins with good CWV graph overlaid on a black background featuring a collage of eCommerce store homepages

Redefining performance

As a company that puts performance first, every new feature, component and element is built with performance in mind.

We've achieved dramatic improvements for Core
Web Vitals since January 2020, and have 

increased the ratio of Wix sites with good scores
for all three CWV by 10x.

See how we did it and how to optimize your site for Core Web Vitals in this webinar we did
with Google.

Robust infrastructure. Smoother experience.

Reliable infrastructure

Our globally distributed CDN and data centers deliver content quickly and efficiently—regardless of your location, network or device.

Real-time monitoring

Performance data is anonymously collected in real-time across our platform— enabling us to monitor and improve website speed on every site.

Enhanced media delivery

We automatically adjust your media on our servers, converting it to WebP for fast downloads and the best look on any device.

Faster file delivery

All our sites use HTTP/3 and HTTP/2 and all components are delivered using Brotli or gzip.

“It's inspiring to see the improvements in user experience / CWV that the folks at Wix have managed for sites hosted on their platform.”

John Mueller, Search Advocate at Google

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See how fast your site loads

Using the Wix Site Speed Dashboard you can:
 

  • Test, analyze and optimize your site’s performance for desktop and mobile

 

  • Monitor your speed and compare with other businesses in your category

 

  • Get actionable tips to provide a better user experience

Wix site performance dashboard showing key site performance metrics; ‘Speed over time’, ‘Speed Benchmark’ and ‘Homepage Score’

 FAQ

How is Wix prioritizing Core Web Vitals (CWV)?

At Wix, we have a performance-first culture. Every new feature, component and element that we create is built with performance in mind. Over the past year, we’ve managed to achieve dramatic improvements for CWV. As a result, we’ve increased the ratio of Wix sites in the Google CrUX report with good scores for all three CWV by 10x. View the latest performance data in Google’s Core Web Vital Technology Report. To learn more about how Wix prepared for CWV, check out this webinar we hosted with Google.

How is Wix optimizing images for better performance?

Everytime you add an image to your site, Wix automatically optimizes it to ensure high quality and small download size. Images are resized and cropped for you so that only the pixels needed are downloaded to the browser. Additionally, images are automatically converted to modern image formats, like WebP, resulting in smaller image size downloaded. Lazy loading is also used so that images are downloaded only when they’re actually required.

What is “real-user data” in the Google PageSpeed Insights (PSI) and why is it not available for all URLs?

When PSI is given a URL, it looks it up in the Chrome User Experience Report (CrUX), which provides data based on how real-world Google Chrome users experience popular destinations on the web—this is known as “real-user data” or “real-user experience data”. Because this is based on how real users have experienced a site, it’s only relevant if there is enough traffic—sites without many visitors won’t have real-user data. 


If it’s available, PSI uses real-user data to report the First Contentful Paint (FCP), First Input Delay (FID), Largest Contentful Paint (LCP), and Cumulative Layout Shift (CLS) metric data for the “origin” (the website’s domain) and potentially specific page URLs. Real-user data is a more accurate way to measure site performance than “simulated environment data” as it represents a true user experience, and is the basis for Core Web Vitals.

Why are Google Lighthouse scores different for desktop and mobile?

Page speed scores for mobile are usually lower than desktop. That’s because PageSpeed Insights (PSI) simulates the page load conditions of a low-end device on slow 4G network throttling for mobile. These conditions represent roughly the bottom 25% of 4G connections and top 25% of 3G connections, which means the performance score a site gets from PSI does not necessarily equate to the real world experience your users will have when visiting your site. 

How does Wix utilize CDNs?

All static resources, such as images and JavaScript files, are served from CDNs. We use a variety of CDN providers, and automatically select the ones that provide the best speed and resilience for each site visitor. All premium domain resources are also served by a CDN, including the HTML document and API calls. They are cached for as long as possible, and are invalidated automatically whenever you change something in your site data. In order to support the best flow, we recommend hosting domains on our platform or using our nameservers.

How does Wix ensure that your site’s performance continues to improve?

While we’ve achieved dramatic improvements in the performance of websites built and hosted on Wix, we continue to investigate new capabilities and enhancements to our platform to further improve site speed. Every feature developed at Wix is tested to ensure that it doesn’t hurt the performance of existing sites. This is accomplished by conducting automated acceptance tests that compare the performance of a wide variety of sites before and after the change. If any performance degradation is detected, the deployment of the new feature is blocked until this is fixed. In addition, the performance of every site session is monitored (anonymously), in real time. This lets us verify that your visitors experience the best possible site speed. To ensure the best performance and user experience for your site, learn more about best practices and tips for site optimization.

Create a site built to perform.