What Specific PageSpeed Insights Metrics Should SEO Professionals Focus on to Enhance User Experience and Search Ranking?


SEO professionals should focus on key PageSpeed Insights metrics such as Largest Contentful Paint (LCP), First Input Delay (FID), Cumulative Layout Shift (CLS), First Contentful Paint (FCP), and Time to Interactive (TTI). Improving these metrics involves optimizing server response times, efficient asset delivery, reducing render-blocking resources, and minimizing unexpected layout shifts. Let's break down each metric and their improvement strategies.

Understanding Key PageSpeed Insights Metrics

Largest Contentful Paint (LCP)

LCP measures the time it takes for the largest content element visible in the viewport to load. For a good user experience, aim for an LCP of 2.5 seconds or less.

Improving LCP

Server Response Time Optimization

Reduce the server response time by utilizing a CDN, server-side caching, and optimizing database queries.

Efficient Asset Delivery

Implement preloading, compression (WebP, Gzip, Brotli), and responsive images techniques.

First Input Delay (FID)

FID measures the time from when a user first interacts with your page to the time when the browser begins processing that interaction. Aim for an FID of 100 milliseconds or less.

Improving FID

Optimize JavaScript Execution

Break up long tasks, defer non-critical JavaScript, and use web workers.

Cumulative Layout Shift (CLS)

CLS measures the visual stability of the page, focusing on unexpected layout shifts. Aim for a CLS of 0.1 or less.

Improving CLS

Size Attribute on Images and Videos

Include width and height size attributes on images and video elements to ensure the reserved space matches the image dimensions.

Font Optimization

Optimize web fonts by using <font-display: swap> property and font subsetting.

First Contentful Paint (FCP)

FCP measures the time from when the page starts loading to when any part of the page's content is rendered. Aim for an FCP of 1.8 seconds or less.

Improving FCP

Preloading Key Resources

Use <link rel="preload"> to prioritize critical resources.

Minimize Render-Blocking Resources

Minimize CSS and JavaScript that block render, using techniques such as minification, defer, and async properties.

Time to Interactive (TTI)

TTI measures the time from when the page starts loading to when it becomes fully interactive. Aim for a TTI of under 5 seconds.

Improving TTI

Optimizing JavaScript

Use code splitting and prioritize essential script loading to reduce the time to interactive.


Improving PageSpeed Insights metrics such as LCP, FID, CLS, FCP, and TTI involves a comprehensive strategy that includes server optimization, efficient asset delivery, minimizing render-blocking resources, and ensuring visual stability. Following these best practices will not only enhance user experience but also improve search rankings.