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xlcalculationmanual in VBa

Dear Experts,

I would like to have a good example website to show how it will have code speed advantage
for Application.Calculation = xlCalculationManual and Application.Calculation = xlCalculationAutomatic
I know those functionality but I wonder what situation we will use it individually  for speed ?

Aud during file save, Is it all formula in Excel sheet will be updated even I set it xlCalculationManual ?

Please advise

Thanks
Duncan l
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duncanb7
Asked:
duncanb7
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1 Solution
 
Ardhendu SarangiSr. Project ManagerCommented:
Hi,
if you search in experts-exchange, you can find good articles about this. THere is also a write-up on C Pearson's site.

Here's the link - http://www.cpearson.com/excel/optimize.htm

From my experience, the advantage to set it xlCalculationManual is if when your data is huge and there are a lot of formulas.

If the  xlCalculationManual is set to manual, it won't update on file save.

Let me know if you need any further clarifications,

Thanks,
Ardhendu
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Saqib Husain, SyedEngineerCommented:
I think formulas are recalculated before save

Saqib
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duncanb7Author Commented:
If recaulation before save ,So it might not help me if my VBA code needs to do open file and save file for automation looping 100 files.

THe function might be good when you are doing a VB code debugging or doing a code for sepcifiy sheet from that you
don't want to recaulate other sheets since other sheets value is not important at this moment

AM i right ?

Please advise

Duncan
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Ardhendu SarangiSr. Project ManagerCommented:
Hi Duncan,

If you use the following code -

Private Sub Workbook_Open()
Application.Calculation = xlCalculationManual

Application.CalculateBeforeSave = False
End Sub

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then this doesn't recalculate while saving.

Application.CalculateBeforeSave = Values are True or False. If calculation is Manual and CalculateBeforeSave is true when you Save the workbook it will be recalculated.
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duncanb7Author Commented:
Dear  pari123,

Thanks for your suggestion ?

But my question, even I don't know

In what situation, xlcalcaulteManual is good for speed optimization  ? or what Is said above is correct  
(THe function might be good when you are doing a VB code debugging or doing a code for sepcifiy sheet from that you
don't want to recaulate other sheets since other sheets value is not important at this moment )

In what situation, Application.CalculateBeforeSave = False,is good for speed optimization  ?




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Ardhendu SarangiSr. Project ManagerCommented:

>> In what situation, Application.CalculateBeforeSave = False,is good for speed optimization  ?

As I mentioned before, it would really make a difference if you have a file with huge volume of data and a lot of formulas. It really differs from sheet to sheet. Say for example, more than 1000 rows of data and 3 columns have formulas in it...so there are 3 * 1000 = 3000 formulas that excel needs to calculate would obivously slow down editing the spreadsheet.

but without looking at the data, you need to make an educated guess on it...
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duncanb7Author Commented:
Thanks for your reply,
It understood more
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