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If you need to recalculate spreadsheet values while the macro is running you can use any of the following commands.The first command recalculates the entire workbook.When the macro is done, automatic calculation needs to be turned back on using the following command.If the macro ends prematurely before this command is processed, you will need to manually reset calculation to automatic in EXCEL. Turn off screen updates Every time VBA writes data to the worksheet it refreshes the screen image that you see. Minimize traffic between VBA and the worksheet Once the macro begins it is important to avoid unnecessary references to the worksheet.But, I have written or downloaded versions of Min(), Max(), Average(), Match(), Norm SInv() and St Dev() that are much faster than the Excel versions. Avoid using Variants in formulas Do not declare a numerical variable as Variant unless necessary.Note that if you choose not to use "Option Explicit" at the beginning of the macro any undefined variable will be a Variant.

This article is primarily focused on Excel VBA macros, however many of these rules apply to Microsoft Access VBA macros as well. Turn off automatic spreadsheet calculation This rule is well known, but it is the most important rule.

Refreshing the image is a considerable drag on performance. Grabbing data from the spreadsheet is a drag on performance.

Avoid reading or writing worksheet data within loops whenever possible.

It is also more efficient to perform all numerical calculations in VBA.

It is frequently tempting to leave formulas in the spreadsheet and call them from the macro.

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