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This causes some additional overhead when your VBA code is executed especially if this variable is used often in your code: A known way to improve Excel VBA speed and efficiency, especially fore large Excel files, is to save your Workbooks in binary XLSB format.
Set the Calculation mode to xl Calculation Manual so that no calculations are carried out within the Excel Workbook until the Calculation mode is changed back to xl Calculation Automatic or by running Application.
Calculate: This is because looping through Objects of a Collection is slower.
It is not so much the presence of this macro that benefits your performance but the impact of the behavior it requires from you.
There are many different articles and post on improving Excel performance.
What I personally was missing was a simple, comprehensive, short overview of how the performance of VBA macros can be improved without needing to read through long articles on how the Excel compiler works bla bla bla.