Regarding LCP

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Nikhil Sharma

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Oct 22, 2021, 3:16:46 AM10/22/21
to Chrome UX Report (Discussions), Rick Viscomi
Hi Rick,

Hope you doing well mate! 

My question is that what negative impact has in LCP high server response, unused javascript and avoiding critical chain! 

 Can you please little on these aspects! 




Thanks
Nikhil! 

Gilberto Cocchi

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Oct 25, 2021, 4:19:20 AM10/25/21
to Nikhil Sharma, Chrome UX Report (Discussions), Rick Viscomi
Hi Nikhil, nice to e-meet you.

Let me share with you this image that hopefully will explain the correlation within LCP by Image (similar on LCP by Text) and with TTFB and render blocking JS/CSS.

Schermata 2021-10-25 alle 10.15.39.png

As you can see from the image a high TTFB can decrease the time to be able to deliver a good LCP to the user, the later the page is returned the higher TTFB would be but respectively this delay propagates to FCP and LCP.

The same is valid for Render Blocking JS and CSS, if there is a lot of Render blocking CSS and JS code on a page and the LCP time is determined by an Image, this time is critical to allow the browser to discover the image as soon as possible and start downloading it (the blu bar) in order to increase the chance to improve the resulting LCP time.

Hope this helps.
Gil

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Gilberto Cocchi
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