对工作表单元格的任何引用都很慢。当您在循环中执行此操作时，这会显着增加。最好的速度提升将来自于限制这些工作表引用。
一种好方法是复制 Variant Arrays 中的数据，然后循环遍历这些数据，构建一个包含要保留的数据的新 Variant Array。然后将新的数组一次性的放在旧的数组上。
使用 200,000 行、20 列、50% 文本、50% 数字的测试数据集，删除 170,000 行：此代码在我的硬件上运行大约 30 秒
Sub Mine2()
Dim T1 As Long, T2 As Long, T3 As Long
Dim ResDelete As Boolean
Dim iPRE As Long, iPOST As Long
Dim EventState As Boolean, CalcState As XlCalculation, PageBreakState As Boolean
Dim iCntr As Long, y As Long, iRows As Long
Dim rPre As Range, rPost As Range
Dim PreDat As Variant, PostDat As Variant, PreDelDat As Variant, PostDelDat As Variant
Dim n As Long
Dim wsPre As Worksheet, wsPost As Worksheet
Set wsPre = ActiveWorkbook.Worksheets("PRE")
With wsPre
Set rPre = .Range(.Cells(1, .Columns.Count).End(xlToLeft), .Cells(.Rows.Count, 1).End(xlUp))
PreDat = rPre.Value
iPRE = UBound(PreDat, 1)
'MsgBox iPRE
End With
Set wsPost = ActiveWorkbook.Worksheets("POST")
With wsPost
Set rPost = .Range(.Cells(1, .Columns.Count).End(xlToLeft), .Cells(.Rows.Count, 1).End(xlUp))
PostDat = rPost.Value
iPOST = UBound(PostDat, 1)
'MsgBox iPOST
End With
If iPRE <> iPOST Then
MsgBox "The number of rows in PRE and POST sheets are not the same. The macro quits"
Exit Sub
End If
iRows = iPRE
ReDim PreDelDat(1 To UBound(PreDat, 1), 1 To UBound(PreDat, 2))
ReDim PostDelDat(1 To UBound(PostDat, 1), 1 To UBound(PostDat, 2))
n = 1
On Error GoTo EH:
'Optimize Performance
Application.ScreenUpdating = False
EventState = Application.EnableEvents
Application.EnableEvents = False
CalcState = Application.Calculation
Application.Calculation = xlCalculationManual
PageBreakState = ActiveSheet.DisplayPageBreaks
ActiveSheet.DisplayPageBreaks = False
T1 = GetTickCount
For y = 1 To UBound(PreDat, 2)
PreDelDat(1, y) = PreDat(1, y)
PostDelDat(1, y) = PostDat(1, y)
Next
n = 2
For iCntr = 2 To UBound(PreDat, 1)
ResDelete = True
For y = 1 To UBound(PreDat, 2)
If PreDat(iCntr, y) <> PostDat(iCntr, y) Then
ResDelete = False
Exit For
End If
Next y
If Not ResDelete Then
For y = 1 To UBound(PreDat, 2)
PreDelDat(n, y) = PreDat(iCntr, y)
PostDelDat(n, y) = PostDat(iCntr, y)
Next
n = n + 1
End If
Next iCntr
T2 = GetTickCount
Debug.Print "Compare Done in:", T2 - T1
Debug.Print "Rows to delete:", n - 1
rPre = PreDelDat
rPost = PostDelDat
T3 = GetTickCount
Debug.Print "Delete Done In:", T3 - T1
CleanUp:
'Revert optmizing lines
On Error Resume Next
ActiveSheet.DisplayPageBreaks = PageBreakState
Application.Calculation = CalcState
Application.EnableEvents = EventState
Application.ScreenUpdating = True
Exit Sub
EH:
' Handle Errors here
Debug.Assert False
Resume
Err.Clear
Resume CleanUp
End Sub
原文：
一种好方法是复制变量数组中的数据，然后循环遍历这些数据，构建对单元格的引用以便稍后删除。然后一次性删除。
其他一般提示：
- 声明所有变量
- 使用更合适的数据类型（Long、Boolean）
- 使用
End(xlUp) 避免在意外空白处失败（除非您想要在第一个空白处停止）
重构代码：
Sub Demo()
Dim ResDelete As Boolean
Dim iPRE As Long, iPOST As Long
Dim EventState As Boolean, CalcState As XlCalculation, PageBreakState As Boolean
Dim iCntr As Long, y As Long, iRows As Long
Dim rPreDelete As Range, rPostDelete As Range
Dim PreDat As Variant, PostDat As Variant
With ActiveWorkbook.Worksheets("PRE")
PreDat = .Range(.Cells(1, 20), .Cells(.Rows.Count, 1).End(xlUp)).Value
iPRE = UBound(PreDat, 1)
'MsgBox iPRE
End With
With ActiveWorkbook.Worksheets("POST")
PostDat = .Range(.Cells(1, 20), .Cells(.Rows.Count, 1).End(xlUp)).Value
iPOST = UBound(PostDat, 1)
'MsgBox iPOST
End With
If iPRE <> iPOST Then
MsgBox "The number of rows in PRE and POST sheets are not the same. The macro quits"
Exit Sub
End If
iRows = iPRE
On Error GoTo EH:
'Optimize Performance
Application.ScreenUpdating = False
EventState = Application.EnableEvents
Application.EnableEvents = False
CalcState = Application.Calculation
Application.Calculation = xlCalculationManual
PageBreakState = ActiveSheet.DisplayPageBreaks
ActiveSheet.DisplayPageBreaks = False
For iCntr = 2 To UBound(PreDat, 1)
ResDelete = True
For y = 1 To 20
If PreDat(iCntr, y) <> PostDat(iCntr, y) Then
ResDelete = False
Exit For
End If
Next y
If ResDelete Then
If rPreDelete Is Nothing Then
Set rPreDelete = Worksheets("PRE").Rows(iCntr)
Set rPostDelete = Worksheets("POST").Rows(iCntr)
Else
Set rPreDelete = Application.Union(rPreDelete, Worksheets("PRE").Rows(iCntr))
Set rPostDelete = Application.Union(rPostDelete, Worksheets("POST").Rows(iCntr))
End If
End If
Next iCntr
If Not rPreDelete Is Nothing Then
rPreDelete.Delete
rPostDelete.Delete
End If
CleanUp:
'Revert optmizing lines
On Error Resume Next
ActiveSheet.DisplayPageBreaks = PageBreakState
Application.Calculation = CalcState
Application.EnableEvents = EventState
Application.ScreenUpdating = True
Exit Sub
EH:
' Handle Errors here
Resume CleanUp
End Sub