For instance, you have an eCommerce website (e.g. WooCommerce, Easy Digital Downloads), and you're worried that unloading one wrong asset could break the "add to cart" functionality or the layout of the product page. You can enable this option, do the unloading for the CSS &amp; JavaScript files you believe are not needed on certain pages, test to check if everything is alright, and then disable test mode to enable the unloading for your visitors too (not only the admin).