Translations:Mutt/10/en

Next to reading messages, it often happens that you will list a mailbox, to see what is in there. For this information, Mutt has to download the message headers. When you switch folders frequently, or your folders contain a large amount of emails, downloading the message headers over and over again will take some time. Since this simply is a waste, Mutt uses a so-called header cache (USE flag ) to keep the most important bits of messages that it needs to greatly speedup opening folders. This header cache is backed by a db-library, of which five flavours exist:,  ,  ,  , and. If you don't have any preference yourself, pick  as it is the fastest when used with Mutt. You can only enable at most one db-library USE flag for  backend. If you re-emerge Mutt with a different db-library later, Mutt will rebuild its caches automatically when it opens a folder.