Improving the performance of FOR loop

Question

I am comparing sheets in a workbook. The workbook has two sheets named PRE and POST with the same 19 columns in each. The number of rows varies every day but are same for th

Answer 1

Perhaps you can go with 2 adjustments, although their performance impact will be only very small:

' prepare references to worksheets
Dim WorksheetPRE As Worksheet
Dim WorksheetPOST As Worksheet
Set WorksheetPRE = ActiveWorkbook.Worksheets("PRE")
Set WorksheetPOST = ActiveWorkbook.Worksheets("POST")

and then, in your code, replace ActiveWorkbook.Worksheets("PRE") for WorksheetPRE etc.

I think no other significant optimizations are possible when you stay in Excel. Remember, Microsoft Excel is primarily a spreadsheet calculator, not a data-table processing tool.

If I really needed to speed-up the comparisons, then I would go with one of these approaches:

• link Excel worksheet to Microsoft Access as table and perform the comparison in Access (easiest)

• as the above, but instead of linking the table, import it

• as the above two, but use Microsoft SQL Server (Express version is free)