Just to add to the discuss:
I have a Solver model (engineering problem called the four-bar crank) with 2
variables and 73 constraints of the form a=0. In XL2003 this takes about 5
seconds; in XL2007 it takes 25 sec. A 1:5 ratio the wrong way around - one
expects newer versions to be faster!
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Bernard V Liengme
www.stfx.ca/people/bliengme
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