On a phone, the cart

On a phone, the cart of a WooCommerce shop selling two books took 11.2 seconds to show its main content. Two cart systems were running at once: the classic WooCommerce cart and the React block cart.

I prepared the changes on a Docker clone of the shop and on a separate WP Staging copy, where the owner placed a test order himself before anything went live. After the cart and checkout were switched to the classic view, the cart's mobile LCP (PageSpeed, cold run) fell the same evening from 11.2 s to 2.2 s. Script tags on the cart page went from 108 to 31 once assets loaded only where they were needed.

A check 26 days later read 2.8 s. On 31 August, after a round of plugin updates, it was 2.1 s.

Case study (in Polish): https://helban.dev/case-studies/woocommerce-cart-speed/