Cyrus Postfix LMTP tuning

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I'm looking for some advice on tuning Cyrus and Postfix to speed up LMTP 
delivery.  We ran a test of our emergency alert system today, which 
generated 20,000 separate emails for delivery.  From the message headers, 
it appears that delivery of some messages took 30 minutes (the one sent to 
my personal account was about 30 minutes).

We are running Cyrus Murder.  Each frontend (there are 3) has:

   lmtp  cmd="/usr/local/cyrus/bin/lmtpproxyd" listen="lmtp" prefork=0 maxchild=25

Each backend (there are 3) has:

   lmtp  cmd="/usr/local/cyrus/bin/lmtpd" listen="lmtp" prefork=1 maxchild=100

Our Postfix relays (there are 3) seem to make one lmtp connection per 
message, rather than sending multiple messages down a single connection.

Do any Cyrus+Postfix users out there have tuning recommendations?  I see a 
lot of postfix lmtp_* config options, but I know little about Postfix.

Thanks,
 	Andy
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