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Core Web Vitals Guide
What LCP, INP and CLS measure, how to read field and lab data correctly, and how to fix the usual causes on WordPress, WooCommerce, Magento and custom sites, including images. Ends with a one-page checklist.
PDF · 17 pages · Updated October 2026
For: Owners, marketers and developers of business websites and online stores.
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What’s inside.
- What Core Web Vitals are, and how much they matter
- The three metrics
- Field data and lab data
- Fixing LCP
- Fixing INP
- Fixing CLS
- Images
- Platform notes
- Hosting's part
- One-page checklist
What you’ll be able to do.
- What LCP, INP and CLS measure, and the scores Google calls good.
- Read field data and lab data correctly, on mobile and from where your customers are.
- Fix the usual causes of slow loading, slow response and layout shift.
- Serve images in the right format and size, with a short image checklist.
- Know what hosting can fix, and what only the site can.
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