“Core Web vitals” … an abstract concept?
At least it felt that way when I first heard about it.
If you are looking for a quick resume. Here is mine: “Make sure specific web concepts are optimized as much as possible on a web/technical level so that the user has the best broswing experience”.
“Core Web Vitals” contributes to “user eXperience” (UX), as such it is a part as SEO factor. So this might be an extra reason to give enough attention to the “Core Web Vitals” inititiave by Google.
The 3 supporting indicators of Core Web Vitals are very cryptic.
Though very technical, the impact is always measured from the end-user point of view, so very user centric oriented.
For every webpage those 3 characteristic can be measured:
- LCP
Loading Contentful Paint
Keyword: loading
How fast will the user be able to start seeing something? - FID
First Input Delay
Keyword: interaction
How fast will the user be able to interact with the page?Meaning click on something, scroll, … - CLS
Cumulative Layout Shift
Keyword: stability
How stable is the web page?
Killer are elements that start moving. Or for example an image that suddenly starts scaling down or up. Those examples are associated with a buggy user experience.
Two types of measurements
- Raw
Based on real-life user data. - Testing
The data by doing intentional tests.
this will be less ‘real’ as one cannot simulate the complete set of factors: network stability, Wifi, Network, CDN, used device (iPhone, Samsun, Google Pixel, … ), used OS (Android, Apple, Windows, Linux, …)
Tools that can be used
- Chrome User Experience report
- https://tools.pingdom.com/
- PageSpeed Insights
- Web Search Console
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