Core Web Vitals assessments can fail for a variety of reasons, including slow server response times, large page sizes, unoptimized images, excessive JavaScript, and poor coding practices. Failure of these assessments can lead to lower SEO rankings and poor user experience.
To pass the Core Web Vitals assessment, you must score “good” on all three Core Web Vitals – Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS) – based on the data ground.
- Good: <= 100ms.
- Needs improvement: > 100ms and <= 300ms.
- Poor: > 300ms
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