Excel中具有大型数据集的VBA子例程的速度问题

我正在创建一个相当广泛的Excel宏，以帮助捕获文件上的常见错误，然后再将其导入到我们公司的系统中。经过大约一个月的开发，我已经将大部分功能编码到多个Sub（为了便于维护）中，我从主Sub中调用了该功能Alfred()。

Sub Alfred() 'the butler 

    Application.ScreenUpdating = False
     Call fileCheck       '  0.57 seconds for 15000 rows
     Call symbolCheck     ' 31.57 seconds for 15000 rows
     Call trimTheHedges   ' 16.21 seconds for 15000 rows
     Call ctdCheck        '  0.28 seconds for 15000 rows
     Call lengthCheck     '  2.21 seconds for 15000 rows
     Call dupKeywordCheck '  0.54 seconds for 15000 rows
     Call colorCheck      '  2.56 seconds for 15000 rows
     Call PRTCheck        '  0.65 seconds for 15000 rows
     Call lminCheck       '139.26 seconds for 15000 rows <- See if we can decrease this and make one for RUSH too
     Call colOpNaCheck    '  0.80 seconds for 15000 rows
     Call colAddCLCheck   '  0.77 seconds for 15000 rows
     Call prodNumCheck    '  1.15 seconds for 15000 rows
     Call bpCheck         '  4.85 seconds for 15000 rows
     Call ucCheck         ' 10.75 seconds for 15000 rows
''''''''''''''''''''''''''''''''''''''''''''''
'''''Total 3.4992 minutes''209.95 seconds'''''
''''''''''''''''''''''''''''''''''''''''''''''
    Application.ScreenUpdating = True
End Sub

在对每个Sub进行计时之后，我意识到我的一个Subs需要很长时间才能完成（Sub lminCheck）。我希望有人可能对如何更好地完成在此特定Sub上执行的任务有所了解。如果可以使用可以加快此任务速度的任何方法，请提供示例（尽可能具体地提供）。我已经关闭ScreenUpdating并且不确定将“计算”转换为xlCalculationManual会很有用（也许我错了吗？），但是我确实在寻找一种方法来重组我的代码（也许使用数组，更好的编码实践等）。 ），这将改善我的Sub的处理时间。

'Checks for LMIN:Y Upcharge Criteria and checks off
'LMIN column of products where LMIN:Y exists
'Run this sub after sub that checks for empty criteria 1/invalid upcharges
'Columns CT & CU are Upcharge Criteria 1 & 2 and Column CP is LMIN
Private Sub lminCheck()

Dim endRange As Integer
Dim usedRange As Range
Dim row As Integer
Dim totalCount As Integer
Dim xid As String
Dim mainProdLine As String

endRange = ActiveSheet.Cells(Rows.count, "CS").End(xlUp).row
Set usedRange = ActiveSheet.Range("CT2:CU" & endRange)

'Count how many times LMIN:Y Upcharge criteria appears in Upcharge 1 & 2 columns
totalCount = WorksheetFunction.CountIf(usedRange, "*LMIN:Y*")

If totalCount <> 0 Then
    Dim lminCount As Integer
    For lminCount = 1 To totalCount
        'This gives us the row of this occurance
        row = Find_nth(usedRange, "LMIN:Y", lminCount)
        'Using row we can look at Column A of the same row to get the XID of the product
        xid = ActiveSheet.Range("A" & row).Value
        'Once we have the xid we can find the main/first line of the product
        Dim tempRange As Range
        Set tempRange = ActiveSheet.Range("A2:A" & endRange)
        mainProdLine = Find_nth(tempRange, xid, 1)
        'Using the main/first line of the product we can now check if the LMIN column is checked
        If ActiveSheet.Range("CP" & mainProdLine).Value <> "Y" Then
            'If column is not checked then check it
            ActiveSheet.Range("CP" & mainProdLine).Value = "Y"
        End If
    Next lminCount
Else
    'Exit entire sub since there are no instances of LMIN:Y to check
    Exit Sub
End If

End Sub

'This is the modified version of the Find_nth Function that is also able to find values if they are in the beginning of a string
Function Find_nth(rng As Range, strText As String, occurence As Integer)
Dim c As Range
Dim counter As Integer
For Each c In rng
    If c.Value = strText Then counter = counter + 1
    If InStr(1, c, strText) = 1 And c.Value <> strText Then counter = counter + 1
    If InStr(1, c, strText) > 1 Then counter = counter + 1
    If counter = occurence Then
        Find_nth = c.row
        '.Address(False,False) eliminates absolute reference ($x$y)
        Exit Function
    End If
Next c
End Function