Disconnect from database

I am using the Informix ODBC driver version 3.01 to connect to a Primac database via a DSN using VB 6. My connection string is:

strUniConn = "PROVIDER=MSDASQL;dsn=PRIMAC_TEST;uid=" & strUID & ";pwd=" & strPWD & ";"

I connect to the database, retrieve information, and then close the connection. However in the database, the connection is not dropped until the program has been inactive for 90-100 seconds. Does anyone know how to make this drop quicker?