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How to Find Slow Pages Hurting Core Web Vitals

How to Find Slow Pages Hurting Core Web Vitals

Author

Date Published

October 24, 2025

Table of contents

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To find slow pages impacting your Core Web Vitals, use tools like Google Search Console, PageSpeed Insights, and Lighthouse to diagnose performance issues. Focus on pages with poor scores in Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS).

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Key Takaways

Google’s Core Web Vitals are critical to SEO and user experience, directly influencing your page rankings.
Underperforming pages often have poor LCP, FID, and CLS scores — common culprits for low rankings.
Google Search Console provides a dedicated Core Web Vitals report that flags problematic URLs.
Tools like PageSpeed Insights and Lighthouse offer actionable diagnostics for individual pages.
Batch performance testing with tools like WebPageTest or Screaming Frog can locate slow pages across a site.
Prioritizing fixes for pages with the most traffic and worst performance delivers the best ROI.

Frequently Asked Questions

What are Google Core Web Vitals?

Slow pages decrease user satisfaction, increase bounce rates, and lower your rankings in Google Search results.

Why should I care about slow pages?

Slow pages decrease user satisfaction, increase bounce rates, and lower your rankings in Google Search results.

Which tool is best for finding slow pages?

Google Search Console gives a high-level view, while PageSpeed Insights and Lighthouse provide in-depth diagnostics. Use Screaming Frog for bulk analysis.

How often should I check Core Web Vitals?

Audit your site monthly or after major content or design changes to ensure consistent performance.

Can Core Web Vitals affect my SEO?

Yes. Since 2021, Core Web Vitals are part of Google’s ranking signals under the Page Experience update.

Step by Step Plan

01

Access Google Search Console

Go to the 'Core Web Vitals' report under the 'Experience' section. This highlights poor URLs categorized by desktop and mobile performance.

02

Use PageSpeed Insights

Copy flagged URLs into PageSpeed Insights. Analyze metrics like LCP, FID, and CLS, along with recommendations for improvement.

03

Run a Site Crawl with Screaming Frog

Connect Screaming Frog to PageSpeed Insights or use Lighthouse API to generate CWV reports in bulk and identify underperformers at scale.

04

Run a Site Crawl with Screaming Frog

Test key pages using WebPageTest’s filmstrip and waterfall tools to uncover render-blocking issues and slow time to first byte.

05

Prioritize & Optimize

Focus on pages with the most traffic and worst scores. Optimize images, defer unused JavaScript, and consider lazy loading to improve performance.

Comparison Table

Good Performing Page
Slow Performing Page
LCP under 2.5s
LCP over 4s
FID under 100ms
FID over 300ms
CLS under 0.1
CLS above 0.25
Optimized images and fonts
Large uncompressed images
Minimal render-blocking resources
Heavy JavaScript blocking interactivity

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Sources

Google Web Vitals Documentation
Google Core Web Vitals for SEO
PageSpeed Insights Tool

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