Is there a way to calculate the cost (time and memory) of excel calculations?

Question

例如，如果我需要决定在使一列成为数组公式还是使另外两列sumif列然后将它们加在一起，那么我该如何做出一个好的决定？

Answer 1

You can use the RangeCalc addin downloadable from http://www.decisionmodels.com/downloads.htm
This gives you accurate timing of the calculation of the selected cells, so you can compare calculating the array formula with 2 SUMIF columns (the SUMIF columns will probably be faster)