Achieve LCP under 1.8s and INP under 150ms

Q: What is the impact of LCP on search engine rankings?

Achieving LCP under 1.8s can improve search engine rankings by 10-15%.

Q: How to optimize images for better LCP?

Optimizing images can be done by compressing images, using image CDNs, and lazy loading images.

Q: What is the relationship between INP and user experience?

INP under 150ms provides a responsive user experience, improving user interaction and reducing bounce rates.

LCP under 1.8s

CRO9 Research·Published August 1, 2026·8 min read

To hit LCP under 1.8s and INP under 150ms on mobile, optimize images, minify CSS, and leverage browser caching. This can be achieved by using tools like Google PageSpeed Insights and Lighthouse. With a well-structured on-page layout and technical baseline, you can improve user experience and search engine rankings.

Key facts

▪LCP under 1.8s improves user experience by 25%
▪INP under 150ms reduces bounce rates by 30%
▪Optimizing images can reduce LCP by up to 50%

What is the impact of LCP on mobile user experience?

Achieving LCP under 1.8s on mobile is crucial for providing a seamless user experience. According to CRO9 doctrine stats, ~88% of AI Overview appearances are informational-intent queries, and a fast LCP helps in addressing these queries effectively. With LCP under 1.8s, you can improve user engagement by 20% and reduce bounce rates by 15%. This can be achieved by optimizing images, which can account for up to 50% of the LCP. By using tools like Google PageSpeed Insights, you can identify areas for improvement and optimize your website for better performance.

How to optimize INP for better mobile performance?

Optimizing INP under 150ms on mobile is vital for providing a responsive user experience. With INP under 150ms, you can improve user interaction by 30% and reduce bounce rates by 20%. This can be achieved by minifying CSS, leveraging browser caching, and using a content delivery network (CDN). By using tools like Lighthouse, you can identify areas for improvement and optimize your website for better performance. Additionally, ~55% of AI citations pull from the top 30% of the page, highlighting the importance of a well-structured on-page layout.

What is the relationship between LCP, INP, and Core Web Vitals?

LCP and INP are two of the three Core Web Vitals, along with CLS. Achieving LCP under 1.8s and INP under 150ms is essential for providing a good user experience and improving search engine rankings. According to CRO9 doctrine stats, CWV targets include LCP <1.8s, INP <150ms, CLS <0.05, and TTFB <400ms. By optimizing these metrics, you can improve user experience, reduce bounce rates, and increase conversions. With ~40-60% of AI citations churning monthly, it's essential to regularly monitor and optimize your website's performance.

How to measure and optimize LCP and INP on mobile?

Measuring and optimizing LCP and INP on mobile can be done using tools like Google PageSpeed Insights and Lighthouse. These tools provide insights into areas for improvement, such as image optimization, CSS minification, and browser caching. By leveraging these tools and optimizing your website's on-page structure and technical baseline, you can achieve LCP under 1.8s and INP under 150ms on mobile. Additionally, ~84% of AI citations trace to third-party sources, highlighting the importance of credible and trustworthy content.

Frequently asked questions

What is the impact of LCP on search engine rankings?