Ce programme s'execute sur une feuille excel de 1500l et 26 colonnes et supprime des caractères speciaux dans 3 colonnes et il est super lent, pc qui rame comme pas possible qd je l execute et j'en vois pas la fin

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Private Sub CommandButton1_Click()
    Dim Cell As Variant, i, j, k
    i = 1 ' SP
    j = 1 'FITCH
    k = 1 'MOODY
 
    Sheets("BBG").Select
    Do While Cells(1, i).Value <> "RTG_SP"
    i = i + 1
    Loop
    Cells(1, i).Select
    Range(Selection, Selection.End(xlDown)).Select
    For Each Cell In Selection
        Cell.Value = Replace(Cell.Value, "/*+", "")
        Cell.Value = Replace(Cell.Value, "/*-", "")
        Cell.Value = Replace(Cell.Value, "/*", "")
        Cell.Value = Replace(Cell.Value, "#N/A N.A.", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A N Ap", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A Sec", "NR")
        Cell.Value = Replace(Cell.Value, "e", "")
        Cell.Value = Replace(Cell.Value, "(P)", "")
        Cell.Value = Replace(Cell.Value, " ", "")
    Next Cell
 
    Do While Cells(1, j).Value <> "RTG_FITCH"
    j = j + 1
    Loop
    Cells(1, j).Select
    Range(Selection, Selection.End(xlDown)).Select
    For Each Cell In Selection
        Cell.Value = Replace(Cell.Value, "/*+", "")
        Cell.Value = Replace(Cell.Value, "/*-", "")
        Cell.Value = Replace(Cell.Value, "/*", "")
        Cell.Value = Replace(Cell.Value, "#N/A N.A.", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A N Ap", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A Sec", "NR")
        Cell.Value = Replace(Cell.Value, "e", "")
        Cell.Value = Replace(Cell.Value, "(P)", "")
        Cell.Value = Replace(Cell.Value, " ", "")
    Next Cell
    Do While Cells(1, k).Value <> "RTG_MOODY"
    k = k + 1
    Loop
    Cells(1, k).Select
    Range(Selection, Selection.End(xlDown)).Select
    For Each Cell In Selection
        Cell.Value = Replace(Cell.Value, "/*+", "")
        Cell.Value = Replace(Cell.Value, "/*-", "")
        Cell.Value = Replace(Cell.Value, "/*", "")
        Cell.Value = Replace(Cell.Value, "#N/A N.A.", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A N Ap", "NR")
        Cell.Value = Replace(Cell.Value, "#N/A Sec", "NR")
        Cell.Value = Replace(Cell.Value, "e", "")
        Cell.Value = Replace(Cell.Value, "(P)", "")
        Cell.Value = Replace(Cell.Value, " ", "")
    Next Cell
End Sub
Qu est ce que je pourrais faire pour ameliorer ce code ?