ObjectStore resolves the host name into the IP address, when accessing a database. If the DNS system gets interfered with or incomplete, the resolving process takes some seconds or even minutes.
The DNS system can be avoided via HOSTS file (C:\Windows\system32\drivers\etc\hosts). The database server needs to be entered in this file. If this doesn't help, the client has to be entered, too.
Alternatively, it is possible to modify connection to other databases (cross database pointers) by using the program osaffiliate.