We haven't had that problem.
DS 6.9 Console performance issues can generally be attributed to the number of people accessing the console at the same time. At one time, we were told that the DS console was designed to have no more than 7 people access the console at the same time. This is because the consoles update in real time, so the more consoles you have open, the more the app and database are updating. We sometimes get around this issue by copying the .exe and required .dlls down to the local PC.
You can always check to see which SQL driver you are using. Try using the SQL Server Native Client v2011.x, instead of the SQL Server v6.x driver.