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Consider the performance gains by implementing your code’s functionality via XLL / C-API.An overview and supporting materials for the SDK can be found here: For each of the code examples below, I had put random values (not formulas) into cells A1: C10000.Here’s a slow, looping method: Dim Data Range as Range Dim Irow as Long Dim Icol as Integer Dim My Var as Double Set Data Range=Range(“A1: C10000”) For Irow=1 to 10000 For icol=1 to 3 My Var=Data Range(Irow, Icol) ‘Read values from the Excel grid 30K times If My Var Dim Data Range As Variant Dim Irow As Long Dim Icol As Integer Dim My Var As Double Data Range = Range(“A1: C10000”).
In this post I’m going to share with you the most important performance tips I know about.
Note that in the code sample below we grab the current state of these properties, turn them off, and then restore them at the end of code execution. Display Page Breaks = False ‘note this is a sheet-level setting ‘: This setting tells Excel to not redraw the screen while False.
One reason this helps is that if you’re updating (via VBA) several different ranges with new values, or copy / pasting from several ranges to create a consolidated table of data, you likely do not want to have Excel taking time and resources to recalculate formulas, display paste progress, or even redraw the grid, especially after every single operation (even more so if your code uses loops). The benefit here is that you probably don’t need Excel using up resources trying to draw the screen since it’s changing faster than the user can perceive.
Value ‘ read all the values at once from the Excel grid, put into an array For Irow = 1 To 10000 For Icol = 1 To 3 My Var = Data Range(Irow, Icol) If My Var 0 Then My Var=My Var*Myvar ‘ Change the values in the array Data Range(Irow, Icol) = My Var End If Next Icol Next Irow Range(“A1: C10000”).
Value = Data Range ‘ writes all the results back to the range at once Note: I first learned of this concept by reading a web page by John Walkenbach found here: A previous Excel blog entry by Dany Hoter also compares these two methods, along with a selection / offset method as well: leads me to my next point.