Built and tuned for real transactional load: checkout, inventory, and order processing.
The difference shows up under real load — carts, product pages, and payment steps all firing at once.
Active WooCommerce stores — real inventory, real checkout traffic, real customers depending on the site staying up. This is the E-Commerce & High Speed tier: a full custom WooCommerce build, or migrating an existing store off an aging cart platform straight onto a server actually built for it.