If you have a blank WooCommerce Subscriptions or WooCommerce Checkout settings page after upgrading to WordPress 4.4 while running WooCommerce Subscriptions, then you might have run into an error caused by a modification in a core file that was released w... Read More
Transients are a WordPress topic, it is not directly connected to WooCommerce per se. They are used to retrieve data out of the SQL database. Using transients is much faster then a normal SQL query, thus making extensive use of them recommendable. Occasionally they do become a problem though.