With WooCommerce Session cache you can preload and cache cart and checkout pages – in the background – separately for every visitors.

When the visitor update the cart (add product to cart, update quantity, remove product from cart, add a coupon, etc), or login, the session cache will be cleared and preloaded for the user.

Every user can see only their own cached pages, because it is linked to WooCommerce session.

You can also disable extra optimization like Critical CSS, Merge Scripts/Styles to speed up the preload process.