There are a number of announcements this month: First up, we have added LCP image subparts to the CrUX API: - Time to First Byte (TTFB) - Resource load delay - Resource load duration - Element render delay These are our recommended way of optimizing LCP: web.dev/articles/opt... 4/10 - ThreadSky

tunetheweb.com • 15 days ago

There are a number of announcements this month:

First up, we have added LCP image subparts to the CrUX API:
- Time to First Byte (TTFB)
- Resource load delay
- Resource load duration
- Element render delay

These are our recommended way of optimizing LCP: https://web.dev/articles/optimize-lcp#lcp-breakdown

4/10

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tunetheweb.com•15 days ago

As those subparts are only for images, you'll want to know how often you have image LCPs. So we added an "LCP resource type metric" so you can see that:

5/10

tunetheweb.com•15 days ago

Next up, we've added RTT tri-bins to the CrUX API which we think are more useful than the increasingly outdated ECT categories.

6/10

tunetheweb.com•15 days ago

In the CrUX BigQuery dataset we've also included the RTT metrics, including the full histogram, and summary p75 and tri-bin data. This is also available at a country break down:

7/10

tunetheweb.com•15 days ago

And finally, we've retired the Effective Connection Type (ECT) dimension. We think RTT is a more useful metric but more importantly but segmenting the data less, that means more sites have reportable data for things like INP, navigation types, and the new LCP subparts and resource types data!

8/10

tunetheweb.com•15 days ago

That's a LOT to take in. So we've written a blog post to cover everything:
https://developer.chrome.com//blog/crux-2025-02

And of course we've updated out docs as well!

We hope you find the additional information useful to aid in debugging Core Web Vitals.

9/10

tunetheweb.com•15 days ago

And if you want to see these new metrics for your site, then CrUX Vis has been updated to include these from today:
https://cruxvis.withgoogle.com/#/

That's all for this month and I’ll catch you next month for more CrUX updates and news!

10/10 🏁 FIN

sia.codes•15 days ago

This is awesome! Do you have any plans for also putting it in bigquery in the future?

tunetheweb.com•15 days ago

I'd certainly like too! One step at a time though...

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