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The hidden costs of whole-column references in Excel: Learn 3 alternatives to optimize your workbook's performance

Whole-column references in Excel are silent performance killers, often forcing the program to manage a range of over a ...
How-To Geek on MSN

You need to know the difference between a range and an array in Excel

Excel processes the range (A1:A10) by converting it into an array in memory. This array is what Excel works with to calculate the sum. The distinction is subtle but important: while the range is the ...