[imp] Sluggish horde/imp

[Kevin Konowalec]

I'm got an IBM 325E server running OpenBSD with the latest releases  
of Horde and Imp.  Cyrus mailserver.  There's lots of memory and lots  
of disk.  The mcrypt extension is enabled in php.ini and the garbage  
collection is set to be 1/100 probability.  Right now we're in pre- 
production mode and only have a handful of concurrent users but  
things are incredibly sluggish.  I've tried moving sessions from an  
external MySQL backend to local PHP default sessions with zero  
effect.  Logging on initially takes upwards of 40 seconds to get to  
my inbox.  Is there any place I should be looking for obvious  
performance boosts?