The impact of leaving automatic calculation turned on can be dramatic.
If the macro is writing values into the worksheet, VBA will need to wait until the worksheet is done recalculating each entry before it can resume. When a new value is entered into a worksheet cell, Excel will recalculate all the cells that refer to it. This rule is well known, but it is the most important rule. Turn off automatic spreadsheet calculation Please note that my estimates of time savings below may vary significantly for your specific application. Rules six through 11 have a marginal impact. The first five rules generally have the largest impact on macro performance. This article is primarily focused on Excel VBA macros, however many of these rules apply to Microsoft Access VBA macros as well. It is easy to lapse into bad programming habits when working with small macros, but with large macros and macros that run a long time it is critical to use efficient coding.
This article lists my top rules for speeding up VBA. As the proud owner of several large VBA macros, I have spent a considerable amount of time looking for ways to make macros run faster.
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