[Dovecot] Dovecot performance under high load (vs. Courier)

[Wojciech Puchar]

>> Nearly all of them are non-caching. (I don't know of any caching ones.)
>
> At least roundcube (v0.7.1 here) has some caching options:
>
> ------------------[excerpt from roundcubes main.inc.php]-------------
> // Type of IMAP indexes cache. Supported values: 'db', 'apc' and 'memcache'.
> $rcmail_config['imap_cache'] = null;
>
> // Enables messages cache. Only 'db' cache is supported.
> $rcmail_config['messages_cache'] = false;
> -------------------------[end]----------------------------------------
>
> But I don't know, whether this is the sort of caching you are referring to.

what's a point of caching imap, except your webmail service is not locally 
connected (localhost or LAN) to imap server?