Have you tried connecting to the sample MS Access CIS database that comes with Cadence software - BENCH.MDB. If you experience similar performance issues then this probably has to do with ODBC drivers installed.
Recently someone had a similar performance issue with MS Access, however the database was hosted in USA and they were accessing from overseas. When they switched backend to the Free MS SQL Server Express edition software the speed went from several minutes on MS Access to less than 5 seconds.
As Steve mentioned I would recommend contacting technical support for a resolution.