Google is updating its Lighthouse 10 tool to remove one of the overall Core Web Vitals metrics, Time To Interactive (TTI).
Google will be assigning the TTI weight to Cumulative Layout Shift (CLS), which will give CLS a total of 25% of the overall performance score.
TTI is not a Core Web Vitals metric used in Search Console or ranking, but it was used in Lighthouse, Google’s developer tool.
What Google said. Google posted on its Chrome developer blog:
“The venerable Time To Interactive (TTI) metric is being removed in Lighthouse 10, concluding the deprecation process started in Lighthouse 8. TTI’s 10% score weight is shifting to Cumulative Layout Shift (CLS), which will now account for 25% of the overall performance score.”
– Brendan Kenny, What’s new in Lighthouse 10
Does it matter for ranking? Technically, this might have zero impact on overall rankings in Google Search. Core Web Vitals is a minimal ranking factor in general and the current Core Web Vitals includes largest contentful paint (LCP), first input delay (FID), and cumulative layout shift (CLS). TTI is not included.
John Mueller from Google confirmed this change does not impact rankings, as we originally reported:
Lighthouse 10 changing. Just the Lighthouse tool is changing. The scores you see in Google Search Console specifically likely won’t change related to TTI being removed. Now, Lighthouse 10 will assign the weights as follows:
- Total blocking time 30%
- Cumulative layout shift 25%
- Largest contentful paint...
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