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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.
Next I learn that Excel uses SHA1 to encrypt spreadsheets instead of the previous method, which I assume was some sort of XOR with a one-character password.
With the new encryption scheme, protecting and unprotecting a worksheet in code takes a touch longer. I don’t know what exactly to do about the protection problem.
Whereas before I was pretty liberal, protecting and unprotecting whenever I needed to, now I’m unprotecting and reprotecting exactly one time. As an experiment, I removed all protection from the templates and removed all the unprotecting and reprotecting from my code. That cuts it in half, although I can’t release this into the wild with no protection.
My client reports that it takes ~90 seconds on his machine.
I sprinkled some splits around the code to see if there was one area causing the problem. There must be something else in 2013 that’s taking a disproportionately long time compared to 2010. Have you experienced performance problems with 2013?
The first thing I did was get stingy about my protection.
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.
It is also more efficient to perform all numerical calculations in VBA.
Tom’s Tutorials for Excel: Color the active cell, row, or column. Press Alt Q to return to the worksheet, then select a few cells to see the effects of the code.
In the picture, three examples are shown that format either the active cell only; the active cell’s entire row and column, or the row and column within the active cell’s current region. To install this behavior for a worksheet, right-click on that worksheet tab, select View Code, and paste either of the following procedures (but not more than one at a time per worksheet) into the large white area that is the worksheet module.