Core Web Vitals are a set of metrics defined by Google to evaluate the quality of user experience on a website. These metrics focus on key aspects such as loading performance, interactivity, and visual stability. The three Core Web Vitals are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS).
Core Web Vitals Thresholds
Core Web Vitals thresholds are categorized into three sections:
Good: Meeting the "Good" threshold means your site provides a high-quality user experience.
Needs Improvement: Falling into the "Needs Improvement" category suggests that while your site is not performing poorly, there are areas that could be optimized to provide a better experience.
Poor: If your site metrics fall into the "Poor" category, it indicates significant issues that need to be addressed to avoid higher bounce rates, losing customers and potential revenue.
These thresholds help web developers and site owners understand how well their websites perform and where improvements are needed.
And these are the thresholds for each Core Web Vitals metric:
Largest Contentful Paint (LCP) Thresholds
Good: Less than or equal to 2.5 seconds
Needs Improvement: Between 2.5 and 4.0 seconds
Poor: More than 4.0 seconds
Interaction to Next Paint (INP) Thresholds
Good: Less than or equal to 200 milliseconds
Needs Improvement: Between 200 and 500 milliseconds
Poor: More than 500 milliseconds
Cumulative Layout Shift (CLS) Thresholds
Good: Less than or equal to 0.1
Needs Improvement: Between 0.1 and 0.25
Poor: More than 0.25
Other Notable Metrics
Besides Core Web Vitals, there are three other important performance metrics part of your Core Web Vitals assessment:
First Contentful Paint (FCP) Thresholds
Good: Less than or equal to 1.8 seconds
Needs Improvement: Between 1.8 and 3.0 seconds
Poor: More than 3.0 seconds
First Input Delay (FID) Thresholds
Good: Less than or equal to 100 milliseconds
Needs Improvement: Between 100 and 300 milliseconds
Poor: More than 300 milliseconds
Time to First Byte (TTFB) Thresholds
Good: Less than or equal to 200 milliseconds
Needs Improvement: Between 200 and 500 milliseconds
Poor: More than 500 milliseconds
The 75th Percentile Explained
Google evaluates Core Web Vitals using the 75th percentile of page views, segmented across mobile and desktop devices. This means that for a page to be considered "Good" in a particular metric, at least 75% of its page loads must meet or exceed the "Good" threshold.
This percentile-based evaluation ensures that the majority of user experiences are considered, providing a more comprehensive assessment of a page's performance.
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