Screen updating macro
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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.Refreshing the image is a considerable drag on performance. Grabbing data from the spreadsheet is a drag on performance.
The reason it speeds up code is because Excel no longer needs to repaint the screen whenever it encounters such commands as Select, Activate, Large Scroll, Small Scroll and many others. Screen Updating=False should be placed at the Start of your macro like shown below Note how we have set the Screen Updating back to True on completion.The first command recalculates the entire workbook.The second command only recalculates a specific sheet.The third command only recalculates a specific Range.When the macro is done, automatic calculation needs to be turned back on using the following command.Avoid reading or writing worksheet data within loops whenever possible.
It is much faster to read the data once and save it into memory than to reread it each time.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.The first five rules generally have the largest impact on macro performance. Please note that my estimates of time savings below may vary significantly for your specific application. When a new value is entered into a worksheet cell, Excel will recalculate all the cells that refer to it.This can happen with recorded macros that have the word Select used frequently.If this does happen, you may need to repeat the line: Application.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.