Since then, Google has also worked on delivering new technologies to optimize web performance as well as experimenting with a potential new performance metric.
What are the Core Web Vitals, and what do they mean for rankings?
The Core Web Vitals are a set of three user experience metrics:
Google collects data for these metrics from real users as part of the Chrome User Experience Report. Pages that do well on these metrics rank higher in search results.
Use priority hints to speed up your website
Last April, Chrome released Priority Hints, a new HTML feature that gives website owners a way to mark the most important resources on a page. This is especially useful for images that cause the Largest Contentful Paint.
By default, all images on a page are loaded with low priority. That’s because before the initial render of the page, the browser can’t tell whether an image element will end up as the hero image or as a small icon in the website footer.
Therefore it’s common for LCP images to be loaded with low priority at first and then switch to high priority later on. That means the browser will wait longer before starting to download the image.
This request waterfall shows an example of that. Note the long gray line where the browser knows about the image but decides it doesn’t need to start loading it yet.
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