proxyd cpu usage

[John Madden]

In a 2.3.15 murder I'm seeing high frontend server cpu usage and I'm 
wondering if it's normal or if there's something I can do to reduce it. 
  What are the bottlenecks that can lead to proxyd pegging a cpu for 
several seconds, particularly during login (using imapproxy to reduce 
logins appears to reduce system load) and when not using TLS?

Frontend's config (trimmed):

defaultpartition: default
partition-default: /dev/null
duplicatesuppression: 0
singleinstancestore: 1
lmtp_downcase_rcpt: yes
allowanonymouslogin: no
popminpoll: 1
umask: 077
allowplaintext: yes
sasl_mech_list: PLAIN
sasl_pwcheck_method: saslauthd
mupdate_config: unified
mupdate_authname: murder
mupdate_port: 3905
lmtpsocket: /var/imap/socket/lmtp
idlesocket: /var/imap/socket/idle
mailnotifier: mailto
notifysocket: /var/imap/socket/notify
sievenotifier: mailto
annotation_db: skiplist
duplicate_db: berkeley-nosync
quota_db: skiplist
subscription_db: skiplist
mboxlist_db: skiplist


Thanks,
   John




-- 
John Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden at ivytech.edu