Hello, In my openldap with mdb I imported a ldif that made add and modify (1000 objects). 95% of the file is processed in 2 minutes without problems. 5% of the rest of file is porcessed in more than 1 hour. The problem is on the groupOfName with lots of member (more than 1000 members). Each modify can take between 3 and 10 minutes. My Openldap is MMR with 2 servers. The problem appears only on one of the two ldap server. On the second one, each modification take 2 seconds. I've tried a reindex of the member attribute but nothing change. I've tried a delete and reimport (ldif file from the second server) the ldap and the problem persist. The configurations are the same on the 2 servers. What can explain this huge time to modify a group ? Exemple of a modification in my ldif file : dn: cn=522495,ou=groupes,ou=XXXXXX,dc=xxxxx,dc=fr changetype: modify add: member member: uid=2142279020,ou=personnes,ou= XXXXXX,dc= xxxxx,dc=fr dn: cn=522813, ou=groupes,ou=XXXXXX,dc=xxxxx,dc=fr changetype: modify add: member member: uid=1021253020,ou=personnes,ou= XXXXXX,dc= xxxxx,dc=fr Thanks a lot by advance Antonin Meunier