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WordPress vs Wix: Winner of Core Web Vitals

WordPress vs Wix: Winner of Core Web Vitals

Google engineer Rick Viscomi tweeted that the Core Web Vitals Technology Report was updated to include July 2021 data from CrUX and HTTPArchive. The data showed how much WordPress and Wix continue to improve in all three Core Web Vitals metrics, FID, LCP and CLS.

There can only be one winner this month.

CrUX data

CrUX is responsible for the Chrome User Experience report. It’s a report on the actual user experience, and this is where the key web vital (CWV) information comes from.

The data is collected from Chrome browsers that have chosen to contribute their information.

This information is called field data.

First Input Delay (FID) WordPress versus Wix

First Input Delay (FID) is a measure of how long it takes for a site to become interactive in terms of buttons, links, dropdowns and other interactive elements.

WordPress is the clear winner in terms of the Wix publishing platform in terms of the First Input Delay metric.

WordPress FID performance improved by six percentage points between May and July 2021, going from 89.4% in May, which received a good FID score, to as much as 95.71% of publishers who experienced a good FID score in July.


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It is a significant performance improvement for WordPress and shows that the WordPress development team is making progress in improving the page experience for users who visit sites published on WordPress.

Wix, on the other hand, started as a leader in May, with 93.79% of publishers enjoying a good FID score. But WordPress overtook Wix in July, when Wix only improved its FID score by less than one percentage point.

Wix went from 93.79% in May to a marginally better 94.6% in July, losing the crown of FID champion to WordPress.

Largest Content Paint (LCP)

Largest Contentful Paint (LCP) is a measure of how long the main content takes to load and get ready for a user to interact with it.

WordPress showed a minimal improvement in the Largest Contentful Paint (LCP) method, which increased by less than one percentage point, from 27.51% in May to 28.11% in July.

Wix, on the other hand, improved by a more impressive 4% from 29.16% in May to 33.43% in July.


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This means that 33.43% of Wix publishers, measured by CrUX, offered a fast LCP page experience versus 28.11% on WordPress.

Wix publishers are five percentage points ahead of WordPress publishers.

While Wix gets a nod to the LCP score, WordPress is practically neck and neck with Wix.

Cumulative Layout Shift (CLS): WordPress vs Wix

Cumulative Layout Shift (CLS) is a measure of how much page elements shift around as a page is downloaded.

A page where a visitor clicks a button and the button jumps around, causing the visitor to click on an ad and leave the site is an example of a page that gives a poor Cumulative Layout Shift (CLS) score.

This is an important metric because pages with elements that bounce around can quickly frustrate users and cause them to jump back to search results.

WordPress CLS score

The WordPress CLS score actually deteriorated between May and July 2021 and dropped from 60.52% in May to 59.94% in July.

The WordPress CLS service had a less than 1% negative degradation.

Screenshot of WordPress CLS Scores

Wix CLS Performance Scores

Wix actually improved their score by over 7%.

Perhaps even more amazing, while 59.94% of WordPress publishers had a passing CLS score in July, and as many as 80.49% of Wix publishers enjoyed a good CLS score.

Screenshot of Wix CLS Scores

With a lead of over 20 percentage points, Wix is ​​the winner in the competition between Wix and WordPress for which gives the best CLS scores.


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What is the reason for cumulative layout change?

Things like commercials, photos, embedded videos and tweets can cause CLS.

It is possible that the way publishers use WordPress is responsible for the significantly poorer CLS performance compared to the Wix platform.

Overall CWV performance: WordPress versus Wix

WordPress CWV Performance Improvement

The report shows that WordPress is constantly improving its CWV performance, but at a modest pace of only 1% per month.

WordPress improved by only 2% between May and July 2021.

The following are the percentages of sites published with WordPress that received good scores.

WordPress CWV service

May 2021 17.1% June 2021 18.9% July 2021 19.1%

Screenshot of WordPress CWV Scores

Wix CWV Performance Improvement

Wix showed an impressive improvement between May and July 2021 and achieved an improvement of six percentage points between May and July 2021.


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The following are Wix Performance Metrics:

May 2021 22.6% June 2021 28.3% July 2021 28.5%

Screenshot of Wix Core Web Vitals Scores

For the overall Core Web Vitals score, Wix leads WordPress by 9 percentage points.

WordPress’ poor CLS performance (compared to Wix’s significantly higher scores) dragged down the overall CWV score for WordPress.

Facts are clear: Wix has a higher CWV score

In the overall Core Web Vitals score, Wix leads WordPress by 9 percentage points.


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Facts are facts: More publishers on the Wix platform generally achieve good Core Web Vitals scores than publishers using WordPress.

In July 2021, 19.1% of WordPress publishers achieved good CWV scores, while 28.5% of Wix publishers enjoyed good CWV scores.

It’s a nearly ten percentage point better performance of Wix compared to WordPress.

The Wix method of managing their web technology can have an advantage over WordPress because Wix is ​​able to control and adjust each web page element so that the site can function according to their standards.

WordPress is an open source content management system (CMS) with thousands of third-party developers contributing themes and plugins that can negatively impact the performance of the page experience.

Wix is ​​improving rapidly

The Wix approach to proprietary closed system shows a faster improvement rate than WordPress. From May to July, the Wix Core Web Vitals score jumped by six percentage points, going from 22.6% to 28.5%.

WordPress saw an improvement, but that improvement was a modest two percentage points and climbed from 17.1% in May to a modestly better 19.1% improvement in July.


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Again, because WordPress is an open source system, some publishers can create sites with faster performance results than Wix. Publishers on the Wix platform do not have the freedom to improve their performance.

But in the Wix publishing ecosystem, having a little control over web performance is performance and not a mistake for publishers who want to focus on business and not on babysitting the underlying technology.

Wix wins … But not much

The faster pace of improvement in CWV scores clearly shows that the Wix method has benefits for certain publishers.

But WordPress is not that far behind.

The competition for Core Web Vital’s excellence continues.


Message tweet by Rick Viscomi

I have updated the Core Web Vitals Technology Report to include July data from CrUX and HTTP archive.

Looking specifically at desktop experiences, the Shopify / Squarespace / Wix saga intensifies 🤠🍿https: //

– Rick Viscomi (@rick_viscomi) August 10, 2021

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