Notes from the storefront
What we keep seeing while building Shopify stores, and while building Photon Cart.
PerformanceCart drawerCore Web VitalsThe speed tax hiding inside Shopify cart drawers
Cart drawer apps often ship JavaScript and CSS to every page, including features you turned off. Here is how that shows up in Core Web Vitals, conversion, and search, and how Photon Cart was designed so unused features never load.
September 28, 2026 · 16 min read