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memberOf group searches very slow



We have some groups that contain over 250,000 members.

Are there any general tips for improving performance when applications/code attempts to lookup memberOf values in the ldap?

For example, I have something like ou=SomeGroup,ou=Groups,o=ourOrg.

ou=SomeGroup has over 250,000 memberOf: values.   Attempting to modify, search, insert, etc.. into that memberOf multivalue field takes over 20 seconds per user.