System is really really slow during data entry...VBA problem?

Hi there,

I have a test application up and running. The main problem is......during data entry, the system is responding really really slow. At the lower right hand corner, it is actually telling me which processors are running(4 of them), and % of completion....

The sheet I've been working on is "VGH Clinic Intake"

Perhaps it is the VBA code I have written? In some other worksheets, thare are embedded calculations as well, which involve another workbook. Could this be the reason???

could anybody help troubleshoot?

Much appreciated.

thank you