Set Excel calculation to manual when you do not want to waste your time while excel calculates the formula after every event. If you face any issue invoking the VBA, refer to the settings here. Public Function UpdateCalculation Application.Calculation = xlCalculationAutomatic Application.ScreenUpdating = True End Function Before using the Manual Calculation mode the overall processing took 10 min to update the excel, now its just 34 seconds. In Excel worksheet, there are three options under Workbook Calculation. You may also want to read: Excel Workbook Calculation This tutorial explains Excel Application Calculation Automatic and Manual.
Then I launch Excel and the first sheet it opens, has automatic as default calculation. Re: force excel default settings to manual calculation mode The problem is when excel has not been running. Set Calculation Mode To Manual Excel Macro.Set Calculation Mode To Manual Excel Macros.Set Calculation Mode To Manual Excel Machine.