Difference scores in Core Web Vitals
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I don’t want to pester you @isaumya
But I have one question that you might be able to help me with.
When I bypass the cache using Development Mode, my Core Web Vitals results are a lot better in PageSpeed Insights.
For instance, Largest Contentful Paint is 2.4 sec with the cache but goes down to 1.9 sec with the dynamic cache in Dev Mode.
First Contentful Paint drops from 1.7 to 1.4 sec, and Speed Index from 2.1 down to 1.9.
Cumulative Layout Shift and Time To Interactive are about the same.
I’ve tested over 20 pages, and the results are always very similar.
Of course, in Dev Mode, my TTFB increases from 40-50 ms up to 600-700 ms.
Do you know what causes this discrepancy?
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