Whats wrong with Excel 2007 on Vista?

>I have a test rig with Office 2007 standard and Vista Enterprise:
> I have another test rig but with Windows 2003 SP1 and Office 2003 Pro:
> Both installations are vanilla and are on a brand new Vista accredited
> Dell
> machine.
>
> I wrote an Excel spreadsheet that includes a common VBA module which only
> iterates through ranges of cells changing the values as it goes.
>
> On the Win2003/Office2003 rig the VBA task completes in 5 secoonds.
> On the Vista/Office2007 rig it takes 118 seconds (whether in compatibility
> mode or after being saved as a macro enabled worksheet)
>
> I have even rewritten the spreadsheet from scratch on the Vista/2007 rig
> as
> a macro enabled workbook and that takes only 18 seconds to complete its
> execution.
>
> I'm quite worried that we may have to redevelop a significant number of
> spreadsheets to accomodate this problem and that even then the result will
> be
> that we will be working much slower with a new desktop than we were with
> our
> old one.
>
> These tests are being done because we need to know if our intention to
> deploy Vista/Office2007 would be a mistake.... Currenetly I suspect the it
> may indead be a major mistake to deploy the Vista/Office2007 combination.
>
> If anyone has any constructive ideas that may help me with this problem
> then
> please please speak up.

>I have a test rig with Office 2007 standard and Vista Enterprise:
> I have another test rig but with Windows 2003 SP1 and Office 2003 Pro:
> Both installations are vanilla and are on a brand new Vista accredited
> Dell
> machine.
>
> I wrote an Excel spreadsheet that includes a common VBA module which only
> iterates through ranges of cells changing the values as it goes.
>
> On the Win2003/Office2003 rig the VBA task completes in 5 secoonds.
> On the Vista/Office2007 rig it takes 118 seconds (whether in compatibility
> mode or after being saved as a macro enabled worksheet)
>
> I have even rewritten the spreadsheet from scratch on the Vista/2007 rig
> as
> a macro enabled workbook and that takes only 18 seconds to complete its
> execution.
>
> I'm quite worried that we may have to redevelop a significant number of
> spreadsheets to accomodate this problem and that even then the result will
> be
> that we will be working much slower with a new desktop than we were with
> our
> old one.
>
> These tests are being done because we need to know if our intention to
> deploy Vista/Office2007 would be a mistake.... Currenetly I suspect the it
> may indead be a major mistake to deploy the Vista/Office2007 combination.
>
> If anyone has any constructive ideas that may help me with this problem
> then
> please please speak up.