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Core Web Vitals notes
INP and LCP on catalogues and checkout. Speed work that shows up in conversion, not only in Lighthouse.
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Performance
Back-forward cache on ecommerce product pages in 2026
Make PLP and PDP eligible for bfcache: drop unload, fix no-store, refresh cart on pageshow, and measure restore rate.
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Performance
View Transitions API for ecommerce catalogues in 2026
Opt in with @view-transition, morph the product image, and cancel on tap so INP does not stall collection to PDP.
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Performance
Speculation Rules for ecommerce: prerender product pages
Use Chrome Speculation Rules to prerender PDP from collection hover. Prefetch first, exclude cart, measure field LCP.
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Performance
Core Web Vitals and INP for online stores
LCP, INP and CLS on PLP, PDP and checkout. Field data beats lab scores. What to fix first on a live store.
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Performance
Reduce JavaScript on checkout pages
Strip chat, reviews and heatmaps from checkout. Keep wallets and payment. Measure begin-checkout to purchase.
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Performance
Image formats that improve LCP on catalogues
AVIF, WebP and JPEG with width, srcset and fetchpriority. Hero images are usually the LCP element on stores.
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Performance
Defer third-party tags without losing data
Load GTM, chat and reviews after first interaction. Keep consent and purchase tags honest. Pattern used here.
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Performance
Hosting, cache and CDN for WordPress stores
Full-page cache, object cache, CDN and what must stay dynamic on WooCommerce cart and checkout.