I post this before and implemented the suggestions, to no avail, so I am
asking for further ideas.

This is Excel 2003 and I have a workbook with 15 tabs, each tab consists of
the following formulas: sumif, sumproduct, vlookup and embedded if
statements. This takes about 10 minutes to calculate and when I hit "save
as", I generally have to wait 15-20 minutes. My PC is a 200 GHz maching with
1 GB of Ram, does anyone have any suggestions as to how I can speed up the
calculations?
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CK