Largest Contentful Paint numbers don't reflect what is seen in the video

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1

Hi Pat,
can you check WebPageTest - Running web page performance and optimization tests...

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

2

Hard to know for sure without looking at how the page works but my guess is this Chrome bug: 1092473 - chromium - An open-source project to help move the web forward. - Monorail

If the page is hidden by setting opacity to 0 and then revealed later, Crome will (incorrectly) count the hidden paints.

3

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.
[hr]
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.