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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 million rows. As a result, they can significantly slow your workbook's ...
How-To Geek on MSN

Don't trust Excel's COUNTA function to count non-blank cells—here's a better method

In most counting scenarios in Excel, COUNTBLANK reliably counts blank cells, and COUNTA reliably counts populated cells.