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Including just one type definition in one row of declarations is the typical mistake: While you would think that all three variables a, b and c are declared as Integer, in fact, only c is!Variables a and b would be declared as Variant, taking up more memory and CPU time.You can turn the Automatic mode to Manual by inserting VBA code in Workbook_Open Event.When you close the workbook, you may want to automatically switch back to Automatic Mode using Workbook_Before Close Event.A macro that works directly in cells would trigger that event very often, therefore incurring a lot of possibly unneeded recalculations. if you need the all open workbooks to be recalculated Active Sheet. if you want to recalculate the active sheet Worksheets(your Worksheet).

The status bar can be accessed like this: In that case, i Current would be the counter giving the current item, and i Total the total number of items to be processed.However, if your Sub Procedure is based on recalculation, you will not be able to use this trick.When you are on Automatic mode, your workbook auto calculates when open and it may take a lot of time.Calculate ' want to calculate only a specific range A lot of users are unaware of the fact that imprecise or missing data type declarations cost both memory and processing time.You should always declare your variables properly, including the data type: But even developers that know about the importance of correct declarations will sometimes apply the concept incorrectly.

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