To reduce load on the dynamic linker, dlopen should cache the modules it opened. At ldb_connect time only the init function should be called, the module does not have to be fetched from disk again.

According to irc:

11:46           vl > abartlet: question -- why do I get the "trying to load 
                     <module>" whenever I issue a lsaquery call against s4?
11:47           vl > abartlet: Couldn't smbd keep a list of loaded modules and 
                     just call the init function when needed?
11:47     abartlet@> yeah, it currently makes one database connection per 
11:48     abartlet@> 'use' - such as an LSA bind (kept for the whole session)
11:48           vl > abartlet: Sure, that part is ok. I mean it a level lower. 
                     Keep a list of dlopen'ed files.
11:48           vl > This should reduce the load on dlopen considerably.
11:48     abartlet@> but that can seem excessive, and simply loading them off 
                     the disk is what tridge noticed was slowing us down
11:48     abartlet@> yeah, that seems very reasonable
11:48           vl > shall I file a bug report with that?
11:49     abartlet@> please do