VBA Remove format from empty cells in Excel - vba

Question

I need a quick code to clean the format of all the cells that are empty.
I have written this code, but it is too slow. Is there a way to make it quicker?
Sub removeFormatEmpty()
'Declaration of variables
Dim sheet As Worksheet
Dim rcell As Range
For Each sheet In Worksheets
sheet.Activate
'Cells.UnMerge
For Each rcell In sheet.UsedRange.Cells
If rcell.MergeCells = True Then
rcell.UnMerge
End If
If rcell.Value = "" Then
rcell.ClearFormats
End If
Next rcell
Next sheet
End Sub
This code works, however it is slow as it needs to go cell by cell. Is there a way to select the whole range except the cells with content?
Update:
Thank you to the comments of bobajob and jordan I've been able to update the code and make it much more faster and optimized. It is the new code:
Sub removeFormatEmptyImproved()
Dim sheet As Worksheet
Application.Calculation = xlCalculationManual
Application.ScreenUpdating = False
For Each sheet In Worksheets
'sheet.Activate
sheet.UsedRange.SpecialCells(xlCellTypeBlanks).ClearFormats
Next sheet
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub
So now it is solved.

Answer 1

Firstly, you don't have to check whether a cell is merged before unmerging it. So to unmerge all cells in sheet...
sheet.UsedRange.UnMerge
You don't need to activate a sheet before altering it
As mentioned in the comments, you can alter all cells at once by using
sheet.UsedRange.SpecialCells(xlCellTypeBlanks).ClearFormats
Turning Calculation to manual and ScreenUpdating to false is an easy go-to method to speed most VBA code up!
Application.Calculation = xlCalculationManual
Application.ScreenUpdating = False
' <other code>
' Include error handling so that these are always set back!
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
So your resulting Sub would be
Sub removeFormatEmpty()
Dim sheet As Worksheet
Application.Calculation = xlCalculationManual
Application.ScreenUpdating = False
For Each sheet In ThisWorkbook.Worksheets
sheet.UsedRange.UnMerge
sheet.UsedRange.SpecialCells(xlCellTypeBlanks).ClearFormats
Next sheet
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub
A final step to speed things up would be to dig into your UsedRange a little more. It can be notorious for remembering long-unused cells and being far bigger than necessary. If you know your sheet layout, there may be a way to restrict the range you are working with.
See some methods for doing this here:
Getting the actual usedrange