Release notes

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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.

202207

Announcement

Publication date
August 09, 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

202206

Announcement

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

202205

Announcement

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

Announcement

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

202203

Announcement

Publication date
April 12, 2022
What's new
  • No significant updates in this release.
Notable stats
  • 8,555,307 origins

202202

Announcement

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

202201

Announcement

Publication date
February 8, 2022
What's new
  • No significant updates in this release.
Notable stats
  • 8,934,350 origins

202112

Announcement

Publication date
January 11, 2022
What's new
  • No significant updates in this release.
Notable stats
  • 8,398,796 origins

202111

Announcement

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

202110

Announcement

Publication date
November 9, 2021
What's new
  • No significant updates in this release.
Notable stats
  • 8,784,894 origins

202109

Announcement

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

202108

Announcement

Publication date
September 14, 2021
What's new
  • No significant updates in this release.
Notable stats
  • 8,431,699 origins

202107

Announcement

Publication date
August 10, 2021
What's new
  • No significant updates in this release.
Notable stats
  • 8,174,923 origins

202106

Announcement

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

202105

Announcement

Publication date
June 8, 2021
Notable stats
  • 8,411,670 origins
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.
  • First Contentful Paint tri-binning thresholds have been updated to be: [0-1.8s], (1.8s-3s), [3s-∞].

202104

Announcement

Publication date
May 11, 2021
Notable stats
  • 8,423,302 origins

202103

Announcement

Publication date
April 13, 2021
Notable stats
  • 8,326,310 origins

202102

Announcement

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).
Notable stats
  • 8,264,371 origins

202101

Announcement

Publication date
February 10, 2021
Notable stats
  • 8,185,540 origins

202012

Announcement

Publication date
January 12, 2021
Notable stats
  • 7,629,156 origins

202011

Announcement

Publication date
December 8, 2020
What's new
  • 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

202010

Announcement

Publication date
November 10, 2020
What's new
Notable stats
  • 8,050,755 origins

202009

Announcement

Publication date
October 13, 2020
What's new
  • No major changes in this release!
Notable stats
  • 7,937,088 origins

202008

Announcement

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

202007

Announcement

Publication date
August 11, 2020
What's new
  • No major changes in this release!
Notable stats
  • 7,527,878 origins

202006

Announcement

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

202005

Announcement

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

202004

Announcement

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

Announcement

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
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

201712

Notable stats
  • 1,939,945 origins

201711

Notable stats
  • 1,237,407 origins
What's new

201710

Notable stats
  • 10,000 origins
What's new

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