Inconsistency between Lighthouse report FCP and Performance tab FCP

Asked Mar 31 '21 at 17:53

Active Mar 31 '21 at 17:53

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I have a website built on Next.js and it's pretty fast so I'm a bit surprised by Lighthouse's bad score. When I check the report it says FCP is 3.8s in.

But when I click "View Original Trace" I'm taken to the performance tab and the timeline says FCP is 91.9ms in:

Which one should I trust ? Why those differences ? Am I reading it wrong ? Thanks in advance

asked Mar 31 '21 at 17:53

gkpo

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Does this help? https://stackoverflow.com/a/64792982/2702894 – GrahamTheDev Mar 31 '21 at 18:12
Yes it does! thank you. The question should be marked as duplicate/related then – gkpo Apr 01 '21 at 14:16
Does this answer your question? [LCP time between LightHouse and Performance - Google Chrome](https://stackoverflow.com/questions/64791933/lcp-time-between-lighthouse-and-performance-google-chrome) – GrahamTheDev Apr 02 '21 at 09:23
No problem, I don't like to just mark things as duplicate in case there is something different about people's question I have missed. I have marked it now! – GrahamTheDev Apr 02 '21 at 09:24
thanks for that :) – gkpo Apr 02 '21 at 14:14

Inconsistency between Lighthouse report FCP and Performance tab FCP

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