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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.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.I had naively assumed that common worksheet functions would be efficiently processed by VBA. For example, most VBA users are probably aware that VBA does not have a Max() or Min() function. It is common to use the following code that uses the Excel version of Max(): I found an open source version of a VBA Max() function on the Internet.It was 10 times faster than the Excel based counterpart above. I concede that the function below only works with two arguments and does not support arrays, but the improvement in speed is substantial.If you need to recalculate spreadsheet values while the macro is running you can use any of the following commands.
This article lists my top rules for speeding up VBA.
It is much faster to read the data once and save it into memory than to reread it each time.
In this example, the macro will need to grab the named Range "issue_age" from the worksheet repeatedly. VBA is much faster when it doesn't need to stop and interact with the worksheet.
I suggest caution when using worksheet functions in large, time consuming macros.
You should evaluate the impact of rewriting the function.
It is also more efficient to perform all numerical calculations in VBA.