What are Core Web Vitals?
Core Web Vitals represent a collection of user experience metrics established by Google, assessing the speed and fluidity with which a webpage loads and interacts. These elements contribute to Google’s ranking criteria, emphasizing three crucial dimensions of page performance: loading speed, interactivity, and visual stability.
Why Core Web Vitals Matter
Ranking Factor:
Google incorporates Core Web Vitals into its Page Experience ranking signals, which has a direct effect on SEO.
User Experience:
Enhanced performance leads to lower bounce rates, extended dwell time, and higher conversion rates.
Mobile-First Era:
In the era of mobile-first indexing, ensuring quick and reliable mobile experiences is essential.
Competitive Advantage:
Websites that are fine-tuned for Core Web Vitals frequently surpass their rivals in terms of both search rankings and user engagement.
The Three Core Web Vitals Metrics
- Largest Contentful Paint (LCP):
- Measures loading performance.
- Good score: ≤ 2.5 seconds.
- First Input Delay (FID):
- Measures interactivity (time before the page responds to the first click).
- Good score: ≤ 100 ms.
- Note: Superseded by INP (Interaction to Next Paint) in 2024 for enhanced precision.
- Cumulative Layout Shift (CLS):
- Measures visual stability (unexpected page shifts).
- Good score: ≤ 0.1.
How SEO Agency Boston Improves Core Web Vitals
We consider Core Web Vitals to be essential for both technical SEO and user experience.
- LCP Optimization: Optimizing images through advanced formats like WebP and AVIF, while enhancing server response efficiency.
- FID/INP Optimization: Reducing JavaScript, postponing non-critical scripts, and activating browser caching.
- CLS Optimization: Allocating areas for visuals and advertisements, implementing CSS aspect ratios, and preventing unexpected content movements.
- Mobile-First Testing: Conducting assessments on mobile devices to verify their performance in practical scenarios.
- Continuous Monitoring: Employing resources such as Google PageSpeed Insights, Lighthouse, and Search Console.
Best Practices for Core Web Vitals
- Incorporate lazy loading techniques for images and videos.
- Implement a Content Delivery Network (CDN) to enhance delivery speed.
- Enhance typography using font-display: exchange
- Reduce the use of external scripts and tracking pixels.
- Consistently evaluate performance using real-user monitoring (RUM) tools.
- Address the cumulative layout problems arising from popups, advertisements, or dynamic components.
Related Terms
- Page Experience
- Mobile-First Indexing
- Technical SEO
- Site Speed Optimization
- User Experience (UX)
Common FAQs About Core Web Vitals
Yes. Although they aren’t the sole determinant, they can serve as a deciding factor in highly competitive areas.
Google Search Console, PageSpeed Insights, and Lighthouse offer reports filled with practical insights for improvement.
Both aspects are evaluated, yet Google places a greater emphasis on mobile performance when it comes to ranking.

Speed, Stability, and Smoothness = Success
At SEO Agency Boston, we enhance Core Web Vitals to guarantee that your site is not only discoverable but also provides an outstanding user experience that drives conversions.
