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Largest Contentful Paint numbers don't reflect what is seen in the video
07-08-2020, 04:09 AM
Post: #1
Largest Contentful Paint numbers don't reflect what is seen in the video
Hi Pat,
can you check https://www.webpagetest.org/result/20070...eb87c47dd/

It reports LCP as 1.84s.. but the video shows content rendering only at 5th second.

https://www.webpagetest.org/video/view.p...7c47dd.1.0
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07-09-2020, 01:58 AM
Post: #2
RE: Largest Contentful Paint numbers don't reflect what is seen in the video
Hard to know for sure without looking at how the page works but my guess is this Chrome bug: https://bugs.chromium.org/p/chromium/iss...3&q=&can=4

If the page is hidden by setting opacity to 0 and then revealed later, Crome will (incorrectly) count the hidden paints.
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07-09-2020, 11:07 AM (This post was last modified: 07-09-2020 11:07 AM by satishsgws.)
Post: #3
RE: Largest Contentful Paint numbers don't reflect what is seen in the video
whoa.. that's a huge bug. Thanks for filing it and getting the Chromium devs to think of a fix.

Maybe this site is using Google Optimize .. maybe it is deliberately setting Opacity to 0.. will check.

will i be able to find that by using the Performance profiler in Chrome? It will be very useful to report on how long that piece of A/B code was executing.

whoa.. that's a huge bug. Thanks for filing it and getting the Chromium devs to think of a fix.

Maybe this site is using Google Optimize .. maybe it is deliberately setting Opacity to 0.. will check.

will i be able to find that by using the Performance profiler in Chrome? It will be very useful to report on how long that piece of A/B code was executing.
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