Hi @braverabbit,
By default, WP Super Cache will cache all the pages on your site. This can increase the size of your cache files and use more resources, especially if your site has many pages. Note that WP Super Cache also allows you to specify pages that you don’t want to be cached.
You can go to the “Rejected URL Strings” section from the Advanced tab to get started. In the text box provided, enter the URLs of the pages that you don’t want the plugin to cache.
For example, if you have an?eCommerce store, then you can exclude pages that visitors don’t often visit and save server resources. These can be the checkout page, account page, and thank you page.