By Kevin Roper 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. This article lists my top rules for speeding up VBA. 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 is primarily focused on Excel VBA macros, however many of these rules apply to Microsoft Access VBA macros as well. The first five rules generally have the largest impact on macro performance. Rules six through 11 have a marginal impact.

Excel VBA Solution: Automatic calculation and manual calculation Question: I want a Button to calculate. With the manual calculation mode, you need to recalculate the formula cells to get the updated result when changing reference cell values. In this article. VBA code: Only recalculate selected cells in Excel Public Sub RecalculateSelection() If TypeName(Selection) = 'Range' Then Selection. 2nd Edition Daphne Al. Calculate End Sub.

Please note that my estimates of time savings below may vary significantly for your specific application. The analysis used Excel 2007. Turn off automatic spreadsheet calculation This rule is well known, but it is the most important rule. When a new value is entered into a worksheet cell, Excel will recalculate all the cells that refer to it. 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. The impact of leaving automatic calculation turned on can be dramatic. I highly recommend turning off automatic calculation using the following command at the beginning of the macro.

Application.Calculation = xlCalculationManual 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. The second command only recalculates a specific sheet. The third command only recalculates a specific Range. Calculate Worksheets('sheet1').Calculate Range('A1:C5').Calculate When the macro is done, automatic calculation needs to be turned back on using the following command.

Reflex After Effects Crack Mac more. If the macro ends prematurely before this command is processed, you will need to manually reset calculation to automatic in EXCEL. Application.Calculation = xlCalculationAutomatic. Partition Wizard Professional 8 1 Keygenguru on this page.

Turn off screen updates Every time VBA writes data to the worksheet it refreshes the screen image that you see. Refreshing the image is a considerable drag on performance. The following command turns off screen updates. Application.ScreenUpdating = FALSE At the end of the macro use the following command to turn screen updates back on. Application.ScreenUpdating = TRUE Rule #3. Minimize traffic between VBA and the worksheet Once the macro begins it is important to avoid unnecessary references to the worksheet.