Optimizing Mailing Lists with Direct LDAP

Hey all,
I've noticed performance issues with iMS 5.2p1 (with iDS 5.1) with respect to direct LDAP look up's, especially for large mailing lists. Even a 28 user list takes 10 minutes, where as with MS 4.1.5 it was practaically instance. We also have a dynamic group with everyone (4000 people or so) and it simply pegs the LDAP server @100% CPU and sits there for a day. It seems that there are a ton of ways to optimize the caches and LDAP lookups. Where should I start or what should I do? What settings should I look to fix on the LDAP server, IMTA, etc. to speed things up?
Thanks!
Chris

This was an LDAP server optimization issue. I increased the memory for both the slapd cache and the database cache. I then added indexes for all the common items search for by the IMTA. I was watching the slapd access logs and saw that the IMTA searchs for a lot of imortant items that are not indexed by default. I added indexes for:
inetUserStatus
mailUserStatus
inetMailGroupStatus
mailEquivalentAddress
mailRoutingAddress
mailMsgMaxBlocks
mailQuota
mailMsgQuota
mailProgramDeliveryInfo
mailDeliveryFileURL
maildeliveryfile
mailConversionTag
mailDeliveryOption
vacationStartDate
vacationEndDate
mailForwardingAddress
memberURL
rfc822mailmember
mailAccessDomain
mailMessageStore
preferredLanguage
mailAllowedServiceAccess
Now a message to everyone that took 24 hours and never went through takes just over a minute to get to 4000 users on my little test server. Smaller dynamic lists are even faster. General performance of message delivery is also faster, as is SMTP response from the client prespective.

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But I tried with the way that you mentioned, but still the problem persists.
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local.ldaphost = dsA.example.com
local.service.pab.ldaphost = dsB.example.com
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Optimizing Mailing Lists with Direct LDAP

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