Is there a faster Alternative to Do Until loops in VBA? - excel

Question

Hello I am wondering if anyone has any suggestions for a replacement for a Do Until loop in VBA??
My Code (see below), basically looks at cell F4, if Cell F4 is 0 then the row is selected and deleted. the cells then shift up, it loops again until the F4 is either greater than zero or it is empty.
The code actually works perfectly well but it takes an age to finish (around 3 mins at a guess). I do make sure that screen updating is turned off etc, I just haven't included that in this example.
I am not to fussed that it takes so long in the first instance but eventually it will doing this search multiple times in one hit, potentially up to 10K cells at a time so I want it to be a bit more snappy...
So my question is is there anything I can do other than Do until loops?
Do Until Raw1.Range("F4") = "" Or Raw1.Range("F4") > 0
If Raw1.Range("F4").Value = 0 Then
Raw1.Range("A4:H4").Select
Selection.Delete Shift:=xlUp
End If
Loop

Answer 1

Delete Data Using AutoFilter
Starting from row 4 (the header row is 3), this will delete all consecutive A:H row ranges, whose cell values in column F are equal to 0 (preserving blank cells).
Option Explicit
Sub DeleteZeros()
' 'Raw1' is the code name of a worksheet in the workbook containing this code.
Const FirstCellAddress As String = "F3"
Const ColumnsAddress As String = "A:H"
If Raw1.FilterMode Then Raw1.ShowAllData
Dim crg As Range ' Column Range (Has Headers - 'F')
With Raw1.Range(FirstCellAddress)
Dim lRow As Long
lRow = Raw1.Cells(Raw1.Rows.Count, .Column).End(xlUp).Row
Dim rCount As Long: rCount = lRow - .Row + 1
If rCount < 2 Then Exit Sub ' to few rows
Set crg = .Resize(rCount)
End With
Dim drg As Range ' Data Range (No Headers - 'A:H')
With crg
Set drg = .Resize(rCount - 1).Offset(1) _
.EntireRow.Columns(ColumnsAddress)
End With
Dim FirstDataRow As Long: FirstDataRow = drg.Row
' Filter Column Range
crg.AutoFilter 1, "0"
Dim vdrg As Range ' Visible Data Range (No Headers - 'A:H')
On Error Resume Next
Set vdrg = drg.SpecialCells(xlCellTypeVisible)
On Error GoTo 0
Raw1.AutoFilterMode = False
' Delete
If vdrg Is Nothing Then Exit Sub
If vdrg.Cells(1).Row <> FirstDataRow Then Exit Sub
vdrg.Areas(1).Delete xlShiftUp
End Sub

Answer 2

It is always a better solution to delete from bottom up then from top down.
Sub deleteRows()
Const checkColumn As Long = 6 'Column F
Dim rg As Range
'!!!!!you will have to adjust this to your needs!!!!
Set rg = ActiveSheet.Cells(checkColumn, 4).CurrentRegion
Dim cntRows As Long
cntRows = rg.Rows.Count
Dim i As Long
For i = cntRows To 1 Step -1
If rg.Cells(i, checkColumn) = 0 Then
'rg.Rows(i).EntireRow.Delete xlShiftUp 'removes entire row
rg.Rows(i).Delete xlShiftUp 'removes only columns A-H
End If
Next
End Sub

Answer 3

It is faster to delete all the cells in 1 operation. In my example code, I have a runner find the last valid cell. I use that cell to determine the size of range that needs to be deleted.
Sub RemoveEmptyRowsBasedOnColumnValues()
Dim CalculationMode As XlCalculation
CalculationMode = Application.Calculation
Application.Calculation = xlCalculationManual
Application.ScreenUpdating = False
Dim Cell As Range
With Raw1
For Each Cell In .Range("F4", .Cells(.Rows.count, "F").End(xlUp))
If Cell.Value > 0 Then
If Cell.Row > 3 Then
.Range("A4:H4").Resize(Cell.Row - 4).Delete Shift:=xlUp
End If
Exit For
End If
Next
End With
Application.Calculation = CalculationMode
End Sub
Function Raw1() As Worksheet
Set Raw1 = ThisWorkbook.Worksheets("Raw1")
End Function