URLs which pass the CWV thresholds already had a

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I decided to look only at the URLs that had CrUX data in the first place. You may remember from part two that, at the time of the update rolling out in August this year, that was some 38.3% of URLs. This is taken from the top 20 results for 10,000 MozCast keywords, across mobile and desktop device types. Blue bar chart showing average rank of URLs with CrUX data in August 2021.


Note that these URLs are all taken from the top 20, so it’s interesting that the afghanistan phone number database averages are both well above the rank of 10.5 we’d expect. This is likely because higher traffic URLs are disproportionately likely to rank well, and also disproportionately likely to have CrUX data. We see a solid 0.39 ranking position lead here for the URLs that pass all three CWV thresholds, above those that fail at least one. Does that mean this is a ranking factor? On the face of it, the above data looks very promising for CWV as a ranking factor.


However, it’s worth tempering our excitement a bit. Let’s have a look at the same data but from May, before the Page Experience update rolled out: Average rank of URLs with CrUx data - May-August 2021. We can notice a few things here: The average rank of URLs with CrUX data was generally worse in August than in May. This is to be expected, as more URLs had CrUX data by August, so it had worked its way further down the rankings.


Ranking difference even before the update. This suggests that perhaps URLs which pass the test were already better in other ways that already counted towards rankings (for example, perhaps rankings were rewarding URLs with a good user experience). The difference between URLs which passed the thresholds and those which did not has grown from 0.38 in May to 0.39 in August — although this is probably very easily within the margin of error.