Who wants to see Subparts for INP?

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Ben Schwarz

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Jul 20, 2025, 10:02:24 PM Jul 20
to Chrome UX Report (Discussions)
Hey there! Ben here from Calibre. We  recently released a new CrUX Metric report for Core Web Vitals metrics , that clearly showcases LCP subparts. In general we find subparts to be very helpful to orient the direction of improvements that need to be made. 

If I had one wish for CrUX today, it would be Interaction to Next Paint Subparts. 

I know it can valuable to hear from the greater community to direct efforts to improve CrUX, so… who wants to see INP subparts? 

Robert Lozano

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Jul 24, 2025, 1:35:42 AM Jul 24
to Ben Schwarz, Chrome UX Report (Discussions)

The more subparts the better!

I loved seeing the LCP subpart, as it allowed me to see the image TTFB subpart of the LCP metric, and how we cut 200ms from that measurement.

More subparts please!

From: 'Ben Schwarz' via Chrome UX Report (Discussions) < chrome-u...@chromium.org >
Sent: Sunday, July 20, 2025 7:02 PM
To: Chrome UX Report (Discussions) < chrome-u...@chromium.org >
Subject: [Marketing Mail] [CrUX Discuss] Who wants to see Subparts for INP?

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Hey there! Ben here from Calibre. We  recently released a new CrUX Metric report for Core Web Vitals metrics , that clearly showcases LCP subparts. In general we find subparts to be very helpful to orient the direction of improvements that need to be made. 

If I had one wish for CrUX today, it would be Interaction to Next Paint Subparts. 

I know it can valuable to hear from the greater community to direct efforts to improve CrUX, so… who wants to see INP subparts? 

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Vipul Nema

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Aug 1, 2025, 5:46:47 PM Aug 1
to Chrome UX Report (Discussions), Robert Lozano, Ben Schwarz
Yes, Subpart really help a lot. 

Vipul Nema

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Aug 1, 2025, 5:46:47 PM Aug 1
to Chrome UX Report (Discussions), Robert Lozano, Ben Schwarz
I Found one issue - discrepancy between  Crux LCP subpart and RUM data subpart is big,  example for some urls Images as LCP report more then 40% but in Newrelic and mpulse which uses google web vitals library only they shows it is  less then 2%. 

On Thursday, July 24, 2025 at 11:05:42 AM UTC+5:30 Robert Lozano wrote:
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