Help:Intersolv ODBC/I-connect to SCO 7.12 performace problem

We just upgrade our informix server from SCO 3.2 Online 5.0 to SCO 5 open server Online 7.12. All 4GL applications & VB3 using ODBC 2.11 with I-Net 5.0 work perfect much faster. Before upgrade, I do test Intersolv ODBC 2.12 on VB4 link to Online 5.0. I can retrieve data from database under reasonable time. But I after upgrade to Online 7.12. Firstful, I have trouble using I/Net v7.2 connect to my server same as Steve Romankiw email say, after I put enter into /etc/hosts.equiv I be able to connect to the server. But when I try run the same VB4 program (just change Connection Data Source), retrieve data back take much longer(10 times). The query is realy simple select sql statement. I call Informix support they say nothing wrong with the Online Engine (I believe so) & I-Connect 7.20 (He say it's stable) and may something wrong VB4 code. Anyone has any clues, tips or tricks, please help me. I do appreciate any kindly help! Thank you.