only half of the problem solved -- cyrus deliver slow

[Lawrence Greenfield]

What version of Sendmail are you using? You want Sendmail 8.12.4 or
later. You should consider running Sendmail in deliverymode=queue with
frequent queue runs if you want the best possible performance. (Take a
look sendmail/TUNING in the Sendmail distribution.)

You should also configure Sendmail as described in the Cyrus
documentation, using LMTP delivery to Cyrus. You don't want "deliver"
processes---it's a completely unnecessary fork.

There's an Addison Wesley book on "sendmail performance tuning" soon
to come out that might help you with this. I'm going to be receiving a
review copy and I'll report on it.

Larry