Instead of slowing every visitor with the full bundle, the shop serves a lighter variant on slow connections, driven by Save-Data and effectiveType.
Offloading compute-heavy JavaScript to a web worker keeps the main thread free, lowers Total Blocking Time and brings INP under the 200 ms threshold.
Native, GPU-accelerated page changes in your shop without a JavaScript framework: how cross-document view transitions smooth the jump from category to product.
A performance budget as a budget.json rule checks every pull request in Lighthouse CI and stops the build the moment LCP, INP or CLS breach the threshold.
Break long JavaScript tasks over 50 ms into chunks with scheduler.yield(), free the main thread between the chunks and keep the INP steadily under 200 ms.
The Long Animation Frames API reveals since Chrome 123 exactly which script causes a slow INP interaction – so you optimize deliberately instead of blindly.
Every redirect costs a round trip before the first byte. Learn how to detect HTTP, www and slug chains and reduce them to a single hop without losing SEO value.
How a service worker with precaching keeps critical files local, serves repeat visits with almost no server round trip and when the effort truly pays off.
Stop optimizing Largest Contentful Paint blindly: measure TTFB, load delay, load time and render delay individually and target the biggest lever deliberately.