What can I do to maximize the performance of my setup?  System has 16gb of ram.

OpenLDAP 2.4.19-15

Import LDIF is 4,611,156 bytes.   Backend is BDB.

du -c -h *.bdb

6.5M    cn.bdb
8.0K    displayName.bdb
1.9M    dn2id.bdb
3.3M    givenName.bdb
17M     id2entry.bdb
5.6M    mail.bdb
740K    objectClass.bdb
7.5M    ou.bdb
3.2M    sn.bdb
3.4M    uid.bdb
8.0K    uidNumber.bdb
48M     total

Portion of slapd.conf:

database        bdb
checkpoint      1024 15

##threads 8
cachesize 100000
idlcachesize 300000
***no dncachesize (default infinite)

Current DB_CONFIG:

# one 0.25 GB cache
##set_cachesize 0 268435456 1
set_cachesize 1 0 1

# Data Directory
#set_data_dir db

# Transaction Log settings
set_lg_regionmax 262144
set_lg_bsize 2097152
#set_lg_dir logs

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