There's an option for this in the settings, it's called "Cover Fetch Depth"
When files are archived they don't necessarily archive in alphabetical order. So a deep fetch will scan through all files to find the first entry alphabetically, which can be very slow if the archives contains hundreds+ of pages.
When files are archived they don't necessarily archive in alphabetical order. So a deep fetch will scan through all files to find the first entry alphabetically, which can be very slow if the archives contains hundreds+ of pages.