Glossary
Cart fragments
The WooCommerce request that keeps the mini-cart fresh — on every page.
What it is
Cart fragments are an AJAX request WooCommerce makes to refresh the mini-cart contents without reloading the page. It runs through admin-ajax and, by default, fires on pages that do not display a cart at all.
Why it costs you money
On a busy store it is a steady stream of uncacheable requests, and it delays interaction on templates where nothing needed refreshing. It is one of the most common single causes of poor INP on WooCommerce.
How to check it yourself
Watch the network panel on a product page for a request containing wc-ajax=get_refreshed_fragments. If it fires where no cart is shown, it can usually be scoped to the templates that need it.
Where this matters