Tu peux tenter le blocage du recalcul automatique
Private Sub Copier_Click()
Dim Plages
Dim Ligne As Long
Dim Col As Integer, L As Integer
Dim Cel As Range
Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
Plages = Array("5:8", "10:11", "13:14")
Col = Cells(2, 1).End(xlToRight).Column
Cells(3, Col + 1) = "Actual"
Cells(3, Col + 1).Font.ColorIndex = xlAutomatic
Cells(2, Col).Clear
For L = 0 To UBound(Plages)
For Each Cel In Application.Intersect(Rows(Plages(L)), Columns(Col))
Cel.Offset(0, 1).Formula = Cel.Formula
Cel.AutoFill Destination:=Cel.Resize(1, 2), Type:=xlFillDefault
Next Cel
Next L
Application.Calculation = xlCalculationAutomatic
End Sub
A+