Google has updated PageSpeed Insights (PSI) to display the data collection period for Chrome User Experience Report (CrUX) metrics, addressing a common frustration among developers.
Barry Pollard, Web Performance Developer Advocate at Google Chrome, announced the change on X:
“Good post. But this thing bugged us: ‘Unfortunately, PageSpeed Insights does not show the data collection period in their UI.’ You know what—they’re right! We thought we should fix that. So we did. Available now on PSI.”
The comment was in response to a DebugBear blog post explaining how to interpret CrUX data and pointing out PSI’s lack of clarity around the time range covered by its metrics.
Good post. But this thing bugged us:
“Unfortunately PageSpeed Insights does not show the data collection period in their UI”
You know what—they’re right! We thought we should fix that. So we did. Available now on PSI. https://t.co/YoMkA41Ae1 pic.twitter.com/tB2gv9PGRg
— Barry Pollard (@tunetheweb) January 13, 2025
What Changed In PSI
CrUX data in PSI is based on the 75th percentile of real user visits over a rolling 28-day period, with a two-day delay.
For example, a test run on January 5 would show data from December 7 to January 3.