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VBA VBA Excel 2000VBA Screen Updating = False, True VBA ms excel 2010VBA Word Screen Updating=False VBA Excel VBA VBA Excel.
This next optimization minimizes how frequently Excel has to respond to the selection changing in the workbook by minimizing the selection changing as much as possible.
The concepts illustrated by the examples above can also be applied to objects other than Ranges and Shapes.
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”).
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”).
An overview and supporting materials for the SDK can be found here:
Declare variables with explicit types to avoid the overhead of determining the data type (repetitively if used in a loop) during code execution.Again, turn it back on right before your code ends execution.: This setting allows you to programmatically set Excel’s calculation mode.For example, if you use VBA to copy/paste a range, while the paste is completing Excel will show the progress of that operation on the status bar.Turning off screen updating is separate from turning off the status bar display so that you can disable screen updating but still provide feedback to the user, if desired.Other Performance Optimizations While the above optimizations are what I consider the most important, there are a few other “honorable mention” optimizations I will mention briefly for you to consider.