The 202105 dataset is live

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Rick Viscomi

۱۸ خرداد ۱۴۰۰، ۱۷:۴۵:۱۰۱۴۰۰/۳/۱۸
به Chrome UX Report (Announcements)
Hi CrUX users,

This is your monthly announcement that the latest dataset has been published to BigQuery.

The 202105 (May 2021) dataset is now available and it covers 8,411,670 origins. Here's a look at origins' Core Web Vitals performance this month:
  • 50.7% of origins had good LCP
  • 89.9% of origins had good FID
  • 60.4% of origins had good CLS
  • 29.2% of origins had good LCP, FID, and CLS
Some important product updates in this release to make you aware of:
  • Starting in this release, CLS will be capped at session windows at most 5 seconds long with a 1 second gap. See Evolving CLS in web tooling by Addy Osmani and Elizabeth Sweeny for more info.
  • The previous CLS implementation will still be available for a limited time in BigQuery under the name `experimental.uncapped_cumulative_layout_shift`.
  • The LCP implementation now reflects the API changes that landed in Chrome 88 in January.
  • The FCP good and poor thresholds have been updated in the CrUX Dashboard and `materialized` tables to 1.8s and 3s respectively. This change applies to all historical data as well.
And we have two community resources to highlight this month:
If you have any questions about CrUX, feel free to reach out to us on any of these channels:


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