Release notes

Published on Sunday, October 1, 2017 • Updated on Tuesday, November 14, 2023

Web Vitals CrUX

The CrUX dataset on BigQuery is updated on the second Tuesday of every month. Each release is numbered according to the year and calendar month of the data collection period, for example 201912 corresponds to the UX data collected during December 2019 and would be released on the second Tuesday of January 2020 after the data collection period has ended.

In the list below, we've curated some release notes for each monthly dataset. Subscribe to our CrUX Announce mailing list or follow @ChromeUXReport on Twitter for release Announcements. The CrUX dataset on BigQuery is generally updated on the second Tuesday of every month. Each release is numbered according to the year and calendar month of the data collection period, for example 201912 corresponds to the UX data collected during December 2019 and would be released on the second Tuesday of January 2020 after the data collection period has ended.

In the list below, we've curated some release notes for each monthly dataset. Subscribe to our CrUX Announce mailing list or follow @ChromeUXReport on Twitter for release Announcements.

202310

Publication date

November 14, 2023

What's new

We're again seeing continual improvements likely due to the final rollout of the front end improvements to LCP started in August which particularly affected LCP (up a further 1.5% this month) and CLS (up 1.6%)

Notable stats

18,383,755 origins

46.9% of origins have good Core Web Vitals

43.4% of origins have good Core Web Vitals when using INP in place of FID as will happen from March 2024.

202309

Publication date

October 10, 2023

What's new

We're again seeing continual improvements across most of the metrics despite the fact that FCP and TTFB actually had slight downturns. This suggests that the front end improvements to LCP mentioned last month which were still rolling out during September, likely more than counter acted these downturns.

One thing not mentioned last month until we saw the impact, was that WordPress had a number of improvements in the latest release, in particular for LCP images. This looks to have resulted in a measurable boost for WordPress sites compared to the web as a whole and, given it is used on about a third of the sites in the CrUX dataset, also would help explain the further improvement in LCP.

While on the subject of LCP, Chrome 117 had a bug whereby LCP may have been incorrect for some SPA applications when observed via Web APIs. This bug did not affect CrUX, nor Google Search Console data which is fed from CrUX. It has been fixed for Chrome 118 which started rolling out last week. If you noticed a large increase in LCP in your RUM solutions then this may have been the reason why.

Notable stats

18,405,462 origins

45.7% of origins have good Core Web Vitals

42.1% of origins have good Core Web Vitals when using INP in place of FID as will happen from March 2024.

202308

Publication date

September 12, 2023

What's new

We're seeing continual improvements across most of the metrics which seem to be driven by the following changes:

Chrome started rolling out a change to increase image priority from low to medium for the first 5 images which may have improved LCP and CLS (testing showed less impact on LCP, and more on CLS).

Chrome made a change for LCP for animated image formats (for example, GIFs) which now measure the first frame rather than the full image load time as the LCP time. This is expected to improve the LCP for the small number of sites that have animated images as LCP elements.

Chrome made another change for LCP whereby video elements are now considered as LCP element candidates. Previously they were only considered with a poster image. As videos are typically larger resources to download, this is expected to deteriorate the LCP for the small number of sites that have videos as LCP elements.

Note that all of these changes are still rolling out so the full effect of all these changes has not been seen yet and hopefully we will see further improvements next month too.

On a less positive note, INP pass rates remained static, showing it's a more tricky metric to optimize for.

Notable stats

18,263,523 origins

45.3% of origins have good Core Web Vitals

41.6% of origins have good Core Web Vitals when using INP in place of FID as will happen from March 2024.

202307

Publication date

August 8, 2023

What's new

As noted last month, we made progress on origins with redirects on their root page not showing in CrUX and since then we resolved the last of the known issues, and this month, no origins should be excluded for this reason.

As warned in the last few releases, we have now removed the experimental prefixed Interaction to Next Paint metric from CrUX BigQuery, API, and History API. Users need to use the non-prefixed field to access this metric.

Notable stats

17,976,663 origins

44.6% of origins have good Core Web Vitals

202306

Publication date

July 11, 2023

What's new

We are pleased to announce that we have finally made progress on the long-standing root page redirect issue mentioned last month. Some origins which redirect their root page, and were therefore excluded from CrUX due to our lack of handling this properly, should now start to be included again from this month. Please note that some origins are still being resolved, so not all origins are in this month's dataset. However, it is great that we have made some good progress on this now and we hope to have the issue fully resolved in the near future.

This is the last month that the INP metric is guaranteed to be available in the CrUX BigQuery, API, and History API both with and without the experimental prefix. We encourage users to move to the non-prefixed field, as the experimental prefix fields should now be considered deprecated and will be removed in 30 days.

Notable stats

18,065,718 origins

44.1% of origins have good Core Web Vitals

202305

Publication date

June 13, 2023

What's new

We're seeing a slight decrease again this month for LCP and FCP due to the final roll outs of the change in LCP to ignore low-entropy images and correction in paint timing discussed last month. However, despite this, the overall good LCP, FID, and CLS rates are up slightly from last month.

We are aware that some origins that redirect their root page (for example, https://www.example.com that automatically redirects to https://www.example.com/en/) are not showing origin-level data in CrUX, and so are also not appearing in the BigQuery dataset. We're also aware that this has been going on for some time. Unfortunately, this is proving a difficult issue to resolve, and so we still do not have an estimated time of when this will be fixed.

Notable stats

18,377,791 origins

43.6% of origins have good Core Web Vitals

202304

Publication date

May 10, 2023

What's new

We're seeing a slight decrease in pass rates for the Core Web Vitals, especially for LCP due in part to a change in LCP to ignore low-entropy images. We also see a decrease in FCP pass rates due to correction in paint timing (which also affects LCP but to a lesser extent).

On a more positive note, the INP pass rate continues to improve with a further increase of 0.2%. This is especially important, as we are moving this metric from an Experimental metric to a Pending metric, and it will join the reset of the Core Web Vitals next year.

From this release, the INP metric is available in the CrUX BigQuery, API, and History API, both with and without the experimental prefix. We encourage users to move to the non-prefixed field, as the experimental prefix fields should now be considered deprecated and will be removed in 90 days.

Notable stats

18,406,973 origins

43.5% of origins have good Core Web Vitals

202303

Publication date

April 11, 2023

Notable stats

18,495,210 origins

44.2% of origins have good Core Web Vitals

202302

Publication date

March 14, 2023

What's new

We're seeing further improvements to the good INP rate which has increased by 2.3% to 77.3% of origins due to the improvement in the Chrome scheduler mentioned last month, which was still rolling out during February.

Notable stats

18,184,396 origins

43.1% of origins have good Core Web Vitals

202301

Publication date

February 14, 2023

What's new

Good INP increased by 4.3% to 75.6% of origins, primarily due to an improvement in the Chrome scheduler. The next frame is now scheduled with highest priority after discrete input events, which shortens the lag between input event and visual update.

This month we've launched a CrUX History API, which provides 25 weeks of historical data at both origin and URL level. We've written a post detailing how to use this new API, and a Colab showing you an example of how to plot this historical data in various graphs.

Notable stats

18,203,637 origins

43.0% of origins have good Core Web Vitals

202212

Publication date

January 10, 2023

What's new

No significant updates in this release.

Notable stats

16,824,271 origins

41.8% of origins have good Core Web Vitals

202211

Publication date

December 13, 2022

What's new

No significant updates in this release.

Notable stats

17,618,944 origins

41.8% of origins have good Core Web Vitals

202210

Publication date

November 8, 2022

What's new

In this release we have further broken down our "rank" popularity. Previously these were in groupings of log 10 (i.e. top 1,000 sites, top 10,000, top 100,000 sites, … up to top 100 million sites). From this release these are provided in half-rank steps (i.e. top 1,000 sites, top 5,000 sites, top 10,000, top 50,000 sites, top 100,000 sites, top 500,000 sites… up to top 100 million sites). The top rank (1,000) will not be altered with this change (i.e. we are not providing a top 500 rank).

Notable stats

17,637,195 origins

41.6% of origins have good Core Web Vitals

202209

Publication date

October 11, 2022

What's new

The CrUX API now includes collectionPeriod object showing what day's data is included in the response as shown below. More details in the CrUX API docs.

    "collectionPeriod": {
      "firstDate": {
        "year": 2022,
        "month": 9,
        "day": 12
      },
      "lastDate": {
        "year": 2022,
        "month": 10,
        "day": 9
      }
    }

Notable stats

17,715,277 origins

41.4% of origins have good Core Web Vitals

202208

Publication date

September 13, 2022

Notable stats

16,754,655 origins

40.7% of origins have good Core Web Vitals

202207

Publication date

August 9, 2022

What's new

This release includes a change which records the CLS metric when the tab is backgrounded in addition to tab close. See the CLS changelog for details.

We have identified a bug in our origin filtering which unfortunately affects a small number of origins, including some popular ones, which are missing from this release. We hope to get this fixed for future releases.

Notable stats

16,190,453 origins

40.6% of origins have good Core Web Vitals

202206

Publication date

July 13, 2022

What's new

The number of origins covered by the CrUX dataset increases once again in this release due to the optional dimensions feature introduced in the previous release. We expect the size to be much more stable from here. Please see the announcement as well.

Notable stats

16,230,572 origins

41.3% of origins have good Core Web Vitals

202205

Publication date

June 14, 2022

What's new

The percentage of origins having good LCP experiences increased this month by 2.4%, thanks in large part to an improvement in the performance of Chrome on Android. This was a major contributing factor to the percentage of origins having good Core Web Vitals increasing by 2.1%.

With this release, CrUX records no longer require effective connection type and form factor, so we're including data for which these fields are NULL, indicating all effective connection types or form factors, respectively. This allows us to increase origin coverage by 28.2%.

An unrelated issue with our data pipeline prevents us from adding new origins in this release, so we're only including origins for which we published data in the previous 6 months. Due to this, experimental.popularity.rank has some gaps, e.g. there are only 904 origins in the top 1,000. This is unique to the 202205 release and should be fixed next month.

Notable stats

11,024,795 origins

42% of origins have good Core Web Vitals

202204

Publication date

May 3, 2022

What's new

This release includes experimental.interaction_to_next_paint, our updated responsiveness metric.

experimental_interaction_to_next_paint in the CrUX API, with thresholds 200ms and 500ms.

experimental_time_to_first_Byte in the CrUX API, with thresholds 800ms and 1800ms.

Notable stats

8,602,902 origins

41.2% of origins have good Core Web Vitals

202203

Publication date

April 12, 2022

What's new

No significant updates in this release.

Notable stats

8,555,307 origins

39.6% of origins have good Core Web Vitals

202202

Publication date

March 8, 2022

What's new

This release includes experimental.responsiveness, our candidate for the new responsiveness metric. See web.dev/responsiveness/ for details.

Notable stats

8,764,246 origins

39.0% of origins have good Core Web Vitals

202201

Publication date

February 8, 2022

What's new

No significant updates in this release.

Notable stats

8,934,350 origins

37.6% of origins have good Core Web Vitals

202112

Publication date

January 11, 2022

What's new

No significant updates in this release.

Notable stats

8,398,796 origins

35.0% of origins have good Core Web Vitals

202111

Publication date

December 14, 2021

What's new

We've removed the old CLS metric: experimental.uncapped_cumulative_layout_shift is no longer in this BigQuery release, and CrUX API no longer serves experimental_uncapped_cumulative_layout_shift. Use the current CLS metric instead.

An LCP fix rolled out with M96.

Notable stats

8,733,078 origins

34.8% of origins have good Core Web Vitals

202110

Publication date

November 9, 2021

What's new

No significant updates in this release.

Notable stats

8,784,894 origins

34.1% of origins have good Core Web Vitals

202109

Publication date

October 12, 2021

What's new

There was a change to FCP in Chrome that ignores content with a style of opacity:0, increasing the user-perceived accuracy of the metric. Read more about it in the Chrome Speed change log.

Notable stats

8,660,068 origins

32.8% of origins have good Core Web Vitals

202108

Publication date

September 14, 2021

What's new

No significant updates in this release.

Notable stats

8,431,699 origins

31.3% of origins have good Core Web Vitals

202107

Publication date

August 10, 2021

What's new

No significant updates in this release.

Notable stats

8,174,923 origins

30.4% of origins have good Core Web Vitals

202106

Publication date

July 13, 2021

What's new

Changes to the FID metric took effect in Chrome 91, resulting in improved FID experiences involving double-tap-to-zoom on mobile.

Notable stats

8,416,608 origins

30.6% of origins have good Core Web Vitals

202105

Publication date

June 8, 2021

Notable stats

8,411,670 origins

29.23% of origins have good Core Web Vitals

Notable Changes

The BigQuery update 202105 includes the same CLS and LCP updates that we released on June 1 for the CrUX API (see below). The previous CLS metric will be available for a limited time as experimental.uncapped_cumulative_layout_shift.

API Update

June 1, 2021

Notable Changes

The new Cumulative Layout Shift definition is now the default metric surfaced as cumulative_layout_shift, the previous Cumulative Layout Shift metric will be available for a limited time as it is phased out as experimental_uncapped_cumulative_layout_shift.

Largest Contentful Paint has undergone adjustments in recent Chrome versions and has been updated similarly in CrUX.

First Contentful Paint tri-binning thresholds have been updated to be: [0-1.8s], (1.8s-3s), [3s-∞].

202104

Publication date

May 11, 2021

Notable stats

8,423,302 origins

25.83% of origins have good Core Web Vitals

202103

Publication date

April 13, 2021

Notable stats

8,326,310 origins

24.81% of origins have good Core Web Vitals

202102

Publication date

March 9, 2021

What's new

Coarse origin ranking data will be available in the CrUX dataset on BigQuery, starting in the February 2021 (202102) release. With this feature, we'll be able to unlock new insights into the aggregate user experiences of the head, torso, and tail of the web. All origins in the global and per-country tables will be assigned rank magnitude values under the experimental namespace, experimental.popularity.rank. Values will be powers of 10, starting with the top 1,000, then 10,000, 100,000, and so on. For example, a rank magnitude of 10,000 means that an origin is among the top 10,000 most visited origins in the dataset (learn more).

Tell us what you think of this new feature. We welcome your feedback on the CrUX discussion forum.

Notable stats

8,264,371 origins

21.98% of origins have good Core Web Vitals

202101

Publication date

February 10, 2021

Notable stats

8,185,540 origins

23.71% of origins have good Core Web Vitals

202012

Publication date

January 12, 2021

Notable stats

7,629,156 origins

23.4% of origins have good Core Web Vitals

202011

Publication date

December 8, 2020

What's new

As of December 3, PageSpeed Insights (web and API) is sourcing its field data from the CrUX API, bringing the tools closer in alignment.

We rolled out a small accuracy improvement to metrics' 75th percentiles in the CrUX API.

The API results were frozen for a few days at the end of November and the issue has since been fixed.

Notable stats

7,942,408 origins

23.5% of origins have good Core Web Vitals

202010

Publication date

November 10, 2020

What's new

A CLS issue in Chrome 86 may cause regressions in CLS scores:

Notable stats

8,050,755 origins

23.7% of origins have good Core Web Vitals

202009

Publication date

October 13, 2020

What's new

No major changes in this release!

Notable stats

7,937,088 origins

24.6% of origins have good Core Web Vitals

202008

Publication date

September 9, 2020

What's new

There was a bump in origin coverage this month (+3.3%) due in part to a data pipeline change. Previously, for a user experience record to be included in the dataset, it must have included FP, DCL, and OL measurements. Now, the only required metric is FCP. This change helps to ensure that we're capturing more meaningful user experiences.

Notable stats

7,773,359 origins

24.9% of origins have good Core Web Vitals

202007

Publication date

August 11, 2020

What's new

No major changes in this release!

Notable stats

7,527,878 origins

25.2% of origins have good Core Web Vitals

202006

Publication date

July 14, 2020

What's new

User experiences served from Google's AMP cache are now attributed to the publisher's origin in CrUX. Effects will vary depending on the amount of AMP cache traffic relative to the rest of the website, but most origins see less than a 5 percentage point change in Core Web Vitals performance, with most effects being positive.

Notable stats

7,501,835 origins

25.34% of origins have good Core Web Vitals

202005

Publication date

June 9, 2020

What's new

There were two LCP updates, which should have a minimal effect on most origins

There was one FID update, which may result in some sites observing faster FID experiences

Notable stats

7,103,486 origins

23.77% of origins have good Core Web Vitals

202004

Publication date

May 12, 2020

What's new

There was a small improvement to the way LCP is measured in M81. This may manifest itself in your CrUX data as a slight shift in slower LCP or in rare cases too few LCP samples to include for your origin.

Introducing Web Vitals! CrUX is committed to providing you with all of your Core Web Vital metrics to give you an accurate picture of how real users experience the web.

Do you query data on a per-country basis? Give the new experimental.country table a try! It's optimized to make querying across country and monthly datasets super easy.

Notable stats

6,389,861 origins

202003

Publication date

April 14, 2020

What's new

CLS histogram start/end values changed from INT64 to NUMERIC type and divided by 100. This change aligns CLS with the fractional layout shift values provided by the Layout Instability API.

Notable stats

5,937,298 origins

202002

Publication date

March 10, 2020

Notable stats

6,366,736 origins

202001

Publication date

February 11, 2020

What's new

Experimental metric on notification permission acceptance rates

Notable stats

5,976,293 origins

201912

Notable stats

5,532,155 origins

201911

Notable stats

5,821,306 origins

What's new

The FID metric was moved from experimental.first_input_delay to first_input.delay

The CLS metric was moved from experimental.cumulative_layout_shift to layout_instability.cumulative_layout_shift

201910

Notable stats

5,752,729 origins

201909

Notable stats

6,008,004 origins

What's new

The LCP metric was launched as largest_contentful_paint

CLS was updated to take move distance into account. Coverage may be lower while Chrome users upgrade to the latest version of the Layout Instability API

201908

Notable stats

6,011,463 origins

What's new

FID coverage has returned to normal

The average percent of fast experiences for most metrics dropped by about 2%, this appears to be due to a bug in Chrome

201907

Notable stats

5,612,504 origins

What's new

There was an incremental update to Chrome's FID implementation, which included pointer events on mobile. Coverage will be lower while Chrome users update to the latest version

201906

Notable stats

5,624,797 origins

What's new

The TTFB metric was added to the list of experimental metrics as experimental.time_to_first_byte

201905

Notable stats

5,884,155 origins

What's new

The CLS metric was added to the list of experimental metrics as experimental.cumulative_layout_shift

201904

Notable stats

5,744,982 origins

What's new

There was an incremental update to Chrome's FID implementation. Coverage will be lower while Chrome users update to the latest version

201903

Notable stats

5,703,255 origins

What's new

There was an incremental update to Chrome's FID implementation. Coverage will be lower while Chrome users update to the latest version

201902

Notable stats

5,464,560 origins

201901

Notable stats

5,351,287 origins

201812

Notable stats

4,654,112 origins

201811

Notable stats

4,697,003 origins

201810

Notable stats

4,374,729 origins

201809

Notable stats

4,375,805 origins

201808

Notable stats

4,386,422 origins

What's new

Histogram bins have been normalized to consistent widths (more info)

201807

Notable stats

4,202,945 origins

201806

Notable stats

4,134,123 origins

What's new

The FID metric was added to the list of experimental metrics as experimental.first_input_delay (learn more)

201805

Notable stats

4,162,633 origins

201804

Notable stats

3,970,181 origins

201803

Notable stats

3,589,954 origins

201802

Notable stats

3,237,524 origins

201801

Notable stats

3,086,603 origins

What's new

Added country dimension

201712

Notable stats

1,939,945 origins

201711

Notable stats

1,237,407 origins

What's new

Expanded dataset with 1M+ origins

201710

Notable stats

10,000 origins

What's new

Chrome User Experience Report beta preview is launched at Chrome Dev Summit

Updated on Tuesday, November 14, 2023 • Improve article