How to perform SumIf using VBA on an array in Excel

Question

I\'m trying to come up with the fastest way to perform a SumIf function in Excel on a dataset that has approx. 110\'000 lines. I\'ve come up with three ways, but none of the

Answer 1

My version was inspired by kevin999's solution.

++ works with unsorted sumif criteria
++ will bring the rows back to the original order

-- doesn't support multiple criteria columns

Please note: The columns containing the criteria and the data to sum up must be one next to another.

Option Explicit

Sub Execute()
Call FasterThanSumifs(1)
End Sub

Private Sub FasterThanSumifs(Criteria As Long)
'Expects two coloumns next to each other:
'SumIf criteria (left side)
'SumIf data range (right side)

Dim SumRange, DataNumber, HelpColumn, SumifColumn, LastRow As Long
SumRange = Criteria + 1
DataNumber = Criteria + 2
HelpColumn = Criteria + 3
SumifColumn = Criteria + 4
LastRow = UF_LetzteZeile()

Columns(DataNumber).Insert Shift:=xlToRight, CopyOrigin:=xlFormatFromLeftOrAbove
Columns(HelpColumn).Insert Shift:=xlToRight, CopyOrigin:=xlFormatFromLeftOrAbove
Columns(SumifColumn).Insert Shift:=xlToRight, CopyOrigin:=xlFormatFromLeftOrAbove

'Remember data order
Cells(2, DataNumber).Value = 1
Cells(2, DataNumber).AutoFill Destination:=Range(Cells(2, DataNumber), Cells(LastRow, DataNumber)), Type:=xlFillSeries

'Sort the range of returned values to place the largest values above the lower ones
Range(Cells(1, Criteria), Cells(LastRow, SumifColumn)).Sort Key1:=Columns(Criteria), Order1:=xlAscending, Header:=xlYes
ActiveSheet.Sort.SortFields.Clear

'If formula sums the range-to-sum where the values are the same
With Range(Cells(2, HelpColumn), Cells(LastRow, HelpColumn))
    .FormulaR1C1 = "=IF(RC[-3]=R[-1]C[-3], RC[-2] + R[-1]C,RC[-2])"
    '.Value = .Value
End With

'If formula returns the maximum value for each concatenated value match &
'is therefore the equivalent of using a Sumifs formula
With Range(Cells(2, SumifColumn), Cells(LastRow, SumifColumn))
    .FormulaR1C1 = "=IF(RC[-4]=R[+1]C[-4], R[+1]C, RC[-1])"
    .Value = .Value
End With

Columns(HelpColumn).Delete

'Sort the range in the original order
Range(Cells(1, Criteria), Cells(LastRow, SumifColumn)).Sort Key1:=Columns(DataNumber), Order1:=xlAscending, Header:=xlYes
ActiveSheet.Sort.SortFields.Clear

Columns(DataNumber).Delete

End Sub