What to do with the result
If the score is below 50
It is almost always images, third-party scripts and fonts. Serve WebP at the right size, load tags after the first user interaction and add font-display: swap.
If LCP is over 2.5 seconds
Find the LCP element in the report. If it is an image, preload it with fetchpriority="high". If it is text, remove render-blocking CSS and fonts.
If CLS is above 0.1
Set width and height on all images and banners, don't inject blocks above content after load, and drop preloaders.
Lab vs field data
PageSpeed shows a lab test and, with enough traffic, real Chrome user data. For smaller sites, collect Web Vitals in GA4 to see the speed your customers actually get.
Questions
Why does the score change between runs?
The test depends on server and network load at that moment. Compare the median of several runs.
What score is good?
90+ is green. More important are Core Web Vitals in the green zone for real users.
Does speed affect ads?
Yes. A slow landing page lowers Google Ads Quality Score and raises cost per click.
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