How to fix “Improve image delivery” in PageSpeed Insights
Diagnose PageSpeed image delivery warnings by separating oversized pixels, inefficient encoding, and slow loading. Includes a deployment checklist.
Image optimization,
explained.
For the people building a faster web. Practical guides to lighter images, better delivery, and the audits that point you in the right direction.
Understand PageSpeed, GTmetrix, LCP, and the images behind your report.
Fix GTmetrix “Properly size images” without making photos blurry
Find oversized image variants in GTmetrix, calculate a sensible pixel width, and deploy responsive replacements without sacrificing desktop clarity.
Fix GTmetrix “Efficiently encode images” with a controlled quality check
Reduce unnecessary image bytes without confusing compression with resizing. Use a practical export comparison and verify the replacement on your live page.
Fix LCP image resource load delay before compressing again
Find why your hero image starts late, separate LCP timing stages, and remove discovery delays without preloading every image on the page.
Why lazy loading your LCP image can make the page slower
Choose an eager policy for critical first-view images and lazy loading for offscreen content. Diagnose hero delays without disabling lazy loading site-wide.
Fix “Serve images in next-gen formats” in GTmetrix
Convert suitable images to WebP or AVIF, update responsive references, and confirm the live response rather than simply renaming the file extension.
Why PageSpeed and GTmetrix disagree about your images
Compare image findings across PageSpeed Insights and GTmetrix by aligning test settings, selected resources, lab metrics, and available field data.