Found via 📌 Add performance testing Active and some profiling.
Coffee module gets the menu structure from an AJAX callback, this AJAX callback is uncacheable, so it builds the menu tree every time. There doesn't appear to be much/any object caching happening either, so the callback takes 100ms in PHP apart from any network overhead.
Install Drupal CMS, log in, visit a page, look at xhr requests in the network tab.
Remove coffee from the the drupal_cms_admin_ui recipe until 📌 Local Storage for Coffee Needs review is committed and in a stable release of Coffee.
Active
Base Recipe
For the record, the coffee AJAX request takes 100ms and 96k function calls and 107 database queries when looking in xhprof, this is compared to 96ms and 74k function calls and 73 database queries for the page itself.
Opened 📌 Get coffee data only when the search box is opened Active .