NAV ODBC Driver 5.0SP1 Speed Issues

Hi, I have just done a technical upgrade of a Navision 3.70 native database to client version 5.0SP1. The basic application is working fine, however we are noticing much slower speeds running queries through the new ODBC driver. The DSNs took a bit of re-configuring due to changes in the new driver (from Simba Technologies) and there is a new limitation on max number of fields which I managed to get round with a registry change. But the speed seems to be a real issue.

Has anybody else noticed this? Any help appreciated,

Jonathan