How to measure Core Web Vitals?

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The recommendation is that this time should not exceed 100 milliseconds, so that the user has a quick response and does not abandon the page. Between 100 ms and 300 ms, it is a warning sign for adjustment. Above 300, it is a bad experience.

Cumulative Layout Shift or CLS is the metric that measures the frequency and severity of unexpected changes in a page's layout. This expression can be translated as " cumulative layout shift ".

These unexpected changes occur when an element on the page changes position while the user is interacting with the page. This happens, for example, when you are going to click on a button, but an element loads and changes the position of that button, causing you to click where you don't want to. This can be extremely irritating and even create problems for the user.

Cumulative Layout Shifts - Google metric
This is usually because page elements are loaded asynchronously japan phone number list or have some dynamic configuration to adapt to the context. So, heavier elements, unsized images , or automatically resized ads can cause sudden movements that disrupt the on-page experience.

To measure this, Google establishes a layout shift score. The score is the result of multiplying the Impact Fraction, which measures how the unstable element impacts the display, and the Distance Fraction, which measures how much the element has moved in the layout.

Google recommends that your page's CLS score be less than 0.1. Between 0.1 and 0.25, you need to make improvements. Above 0.25 means the user is having a bad experience with sudden page changes.

Core Web Vitals
With the announcement of Core Web Vitals, Google also said it was adjusting its SEO tools to incorporate the metrics. Below, we'll walk you through the main capabilities of the analytics tools.

It's important to know that Core Web Vitals metrics can be measured in the lab ( lab data ) or in the field ( field data ).