Speed xl-2k compared to 2003

[Urban]

Can anyone explain the difference?

Excel 2003, P4 -2,0000 MHz time for calc 1 min 54 seconds
Excel 2000, P2 -400 MHz, time for calculation 27 seconds

Both computers are using Windows 2000 Pro

You can find the program on RETScreen.net check Wind3
model and risk analysis. The times above are from a new
model we are developing.

I have eliminated OFFSET and trying to minimize arrays.

Thanks for the help,

Urban