“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:
Loading Contentful Paint
How fast will the user be able to start seeing something?
First Input Delay
How fast will the user be able to interact with the page?Meaning click on something, scroll, …
Cumulative Layout Shift
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
Based on real-life user data.
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
- PageSpeed Insights
- Web Search Console